Chapter 38. Mail
Chapter 38. Mail Both producer and consumer are supported The Mail component provides access to Email via Spring's Mail support and the underlying JavaMail system. Maven users will need to add the following dependency to their pom.xml for this component: <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-mail</artifactId> <version>{CamelSBVersion}</version> <!-- use the same version as your Camel core version --> </dependency> Note POP3 or IMAP POP3 has some limitations and end users are encouraged to use IMAP if possible. Note Using mock-mail for testing You can use a mock framework for unit testing, which allows you to test without the need for a real mail server. However you should remember to not include the mock-mail when you go into production or other environments where you need to send mails to a real mail server. Just the presence of the mock-javamail.jar on the classpath means that it will kick in and avoid sending the mails. 38.1. URI format Mail endpoints can have one of the following URI formats (for the protocols, SMTP, POP3, or IMAP, respectively): The mail component also supports secure variants of these protocols (layered over SSL). You can enable the secure protocols by adding s to the scheme: 38.2. Configuring Options Camel components are configured on two separate levels: component level endpoint level 38.2.1. Configuring Component Options The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth. Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all. Configuring components can be done with the Component DSL , in a configuration file (application.properties|yaml), or directly with Java code. 38.2.2. Configuring Endpoint Options Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both. Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL as a type safe way of configuring endpoints. A good practice when configuring options is to use Property Placeholders , which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse. The following two sections lists all the options, firstly for the component followed by the endpoint. 38.3. Component Options The Mail component supports 43 options, which are listed below. Name Description Default Type bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false boolean closeFolder (consumer) Whether the consumer should close the folder after polling. Setting this option to false and having disconnect=false as well, then the consumer keep the folder open between polls. true boolean copyTo (consumer) After processing a mail message, it can be copied to a mail folder with the given name. You can override this configuration value, with a header with the key copyTo, allowing you to copy messages to folder names configured at runtime. String decodeFilename (consumer) If set to true, the MimeUtility.decodeText method will be used to decode the filename. This is similar to setting JVM system property mail.mime.encodefilename. false boolean delete (consumer) Deletes the messages after they have been processed. This is done by setting the DELETED flag on the mail message. If false, the SEEN flag is set instead. As of Camel 2.10 you can override this configuration option by setting a header with the key delete to determine if the mail should be deleted or not. false boolean disconnect (consumer) Whether the consumer should disconnect after polling. If enabled this forces Camel to connect on each poll. false boolean handleFailedMessage (consumer) If the mail consumer cannot retrieve a given mail message, then this option allows to handle the caused exception by the consumer's error handler. By enable the bridge error handler on the consumer, then the Camel routing error handler can handle the exception instead. The default behavior would be the consumer throws an exception and no mails from the batch would be able to be routed by Camel. false boolean mimeDecodeHeaders (consumer) This option enables transparent MIME decoding and unfolding for mail headers. false boolean moveTo (consumer) After processing a mail message, it can be moved to a mail folder with the given name. You can override this configuration value, with a header with the key moveTo, allowing you to move messages to folder names configured at runtime. String peek (consumer) Will mark the javax.mail.Message as peeked before processing the mail message. This applies to IMAPMessage messages types only. By using peek the mail will not be eager marked as SEEN on the mail server, which allows us to rollback the mail message if there is an error processing in Camel. true boolean skipFailedMessage (consumer) If the mail consumer cannot retrieve a given mail message, then this option allows to skip the message and move on to retrieve the mail message. The default behavior would be the consumer throws an exception and no mails from the batch would be able to be routed by Camel. false boolean unseen (consumer) Whether to limit by unseen mails only. true boolean fetchSize (consumer (advanced)) Sets the maximum number of messages to consume during a poll. This can be used to avoid overloading a mail server, if a mailbox folder contains a lot of messages. Default value of -1 means no fetch size and all messages will be consumed. Setting the value to 0 is a special corner case, where Camel will not consume any messages at all. -1 int folderName (consumer (advanced)) The folder to poll. INBOX String mapMailMessage (consumer (advanced)) Specifies whether Camel should map the received mail message to Camel body/headers/attachments. If set to true, the body of the mail message is mapped to the body of the Camel IN message, the mail headers are mapped to IN headers, and the attachments to Camel IN attachment message. If this option is set to false then the IN message contains a raw javax.mail.Message. You can retrieve this raw message by calling exchange.getIn().getBody(javax.mail.Message.class). true boolean bcc (producer) Sets the BCC email address. Separate multiple email addresses with comma. String cc (producer) Sets the CC email address. Separate multiple email addresses with comma. String from (producer) The from email address. camel@localhost String lazyStartProducer (producer) Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false boolean replyTo (producer) The Reply-To recipients (the receivers of the response mail). Separate multiple email addresses with a comma. String subject (producer) The Subject of the message being sent. Note: Setting the subject in the header takes precedence over this option. String to (producer) Sets the To email address. Separate multiple email addresses with comma. String javaMailSender (producer (advanced)) To use a custom org.apache.camel.component.mail.JavaMailSender for sending emails. JavaMailSender additionalJavaMailProperties (advanced) Sets additional java mail properties, that will append/override any default properties that is set based on all the other options. This is useful if you need to add some special options but want to keep the others as is. Properties alternativeBodyHeader (advanced) Specifies the key to an IN message header that contains an alternative email body. For example, if you send emails in text/html format and want to provide an alternative mail body for non-HTML email clients, set the alternative mail body with this key as a header. CamelMailAlternativeBody String attachmentsContentTransferEncodingResolver (advanced) To use a custom AttachmentsContentTransferEncodingResolver to resolve what content-type-encoding to use for attachments. AttachmentsContentTransferEncodingResolver authenticator (advanced) The authenticator for login. If set then the password and username are ignored. Can be used for tokens which can expire and therefore must be read dynamically. MailAuthenticator autowiredEnabled (advanced) Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true boolean configuration (advanced) Sets the Mail configuration. MailConfiguration connectionTimeout (advanced) The connection timeout in milliseconds. 30000 int contentType (advanced) The mail message content type. Use text/html for HTML mails. text/plain String contentTypeResolver (advanced) Resolver to determine Content-Type for file attachments. ContentTypeResolver debugMode (advanced) Enable debug mode on the underlying mail framework. The SUN Mail framework logs the debug messages to System.out by default. false boolean ignoreUnsupportedCharset (advanced) Option to let Camel ignore unsupported charset in the local JVM when sending mails. If the charset is unsupported then charset=XXX (where XXX represents the unsupported charset) is removed from the content-type and it relies on the platform default instead. false boolean ignoreUriScheme (advanced) Option to let Camel ignore unsupported charset in the local JVM when sending mails. If the charset is unsupported then charset=XXX (where XXX represents the unsupported charset) is removed from the content-type and it relies on the platform default instead. false boolean javaMailProperties (advanced) Sets the java mail options. Will clear any default properties and only use the properties provided for this method. Properties session (advanced) Specifies the mail session that camel should use for all mail interactions. Useful in scenarios where mail sessions are created and managed by some other resource, such as a JavaEE container. When using a custom mail session, then the hostname and port from the mail session will be used (if configured on the session). Session useInlineAttachments (advanced) Whether to use disposition inline or attachment. false boolean headerFilterStrategy (filter) To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter header to and from Camel message. HeaderFilterStrategy password (security) The password for login. See also setAuthenticator(MailAuthenticator). String sslContextParameters (security) To configure security using SSLContextParameters. SSLContextParameters useGlobalSslContextParameters (security) Enable usage of global SSL context parameters. false boolean username (security) The username for login. See also setAuthenticator(MailAuthenticator). String 38.4. Endpoint Options The Mail endpoint is configured using URI syntax: with the following path and query parameters: 38.4.1. Path Parameters (2 parameters) Name Description Default Type host (common) Required The mail server host name. String port (common) The port number of the mail server. int 38.4.2. Query Parameters (66 parameters) Name Description Default Type bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false boolean closeFolder (consumer) Whether the consumer should close the folder after polling. Setting this option to false and having disconnect=false as well, then the consumer keep the folder open between polls. true boolean copyTo (consumer) After processing a mail message, it can be copied to a mail folder with the given name. You can override this configuration value, with a header with the key copyTo, allowing you to copy messages to folder names configured at runtime. String decodeFilename (consumer) If set to true, the MimeUtility.decodeText method will be used to decode the filename. This is similar to setting JVM system property mail.mime.encodefilename. false boolean delete (consumer) Deletes the messages after they have been processed. This is done by setting the DELETED flag on the mail message. If false, the SEEN flag is set instead. As of Camel 2.10 you can override this configuration option by setting a header with the key delete to determine if the mail should be deleted or not. false boolean disconnect (consumer) Whether the consumer should disconnect after polling. If enabled this forces Camel to connect on each poll. false boolean handleFailedMessage (consumer) If the mail consumer cannot retrieve a given mail message, then this option allows to handle the caused exception by the consumer's error handler. By enable the bridge error handler on the consumer, then the Camel routing error handler can handle the exception instead. The default behavior would be the consumer throws an exception and no mails from the batch would be able to be routed by Camel. false boolean maxMessagesPerPoll (consumer) Specifies the maximum number of messages to gather per poll. By default, no maximum is set. Can be used to set a limit of e.g. 1000 to avoid downloading thousands of files when the server starts up. Set a value of 0 or negative to disable this option. int mimeDecodeHeaders (consumer) This option enables transparent MIME decoding and unfolding for mail headers. false boolean moveTo (consumer) After processing a mail message, it can be moved to a mail folder with the given name. You can override this configuration value, with a header with the key moveTo, allowing you to move messages to folder names configured at runtime. String peek (consumer) Will mark the javax.mail.Message as peeked before processing the mail message. This applies to IMAPMessage messages types only. By using peek the mail will not be eager marked as SEEN on the mail server, which allows us to rollback the mail message if there is an error processing in Camel. true boolean sendEmptyMessageWhenIdle (consumer) If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead. false boolean skipFailedMessage (consumer) If the mail consumer cannot retrieve a given mail message, then this option allows to skip the message and move on to retrieve the mail message. The default behavior would be the consumer throws an exception and no mails from the batch would be able to be routed by Camel. false boolean unseen (consumer) Whether to limit by unseen mails only. true boolean exceptionHandler (consumer (advanced)) To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. ExceptionHandler exchangePattern (consumer (advanced)) Sets the exchange pattern when the consumer creates an exchange. Enum values: InOnly InOut InOptionalOut ExchangePattern fetchSize (consumer (advanced)) Sets the maximum number of messages to consume during a poll. This can be used to avoid overloading a mail server, if a mailbox folder contains a lot of messages. Default value of -1 means no fetch size and all messages will be consumed. Setting the value to 0 is a special corner case, where Camel will not consume any messages at all. -1 int folderName (consumer (advanced)) The folder to poll. INBOX String mailUidGenerator (consumer (advanced)) A pluggable MailUidGenerator that allows to use custom logic to generate UUID of the mail message. MailUidGenerator mapMailMessage (consumer (advanced)) Specifies whether Camel should map the received mail message to Camel body/headers/attachments. If set to true, the body of the mail message is mapped to the body of the Camel IN message, the mail headers are mapped to IN headers, and the attachments to Camel IN attachment message. If this option is set to false then the IN message contains a raw javax.mail.Message. You can retrieve this raw message by calling exchange.getIn().getBody(javax.mail.Message.class). true boolean pollStrategy (consumer (advanced)) A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel. PollingConsumerPollStrategy postProcessAction (consumer (advanced)) Refers to an MailBoxPostProcessAction for doing post processing tasks on the mailbox once the normal processing ended. MailBoxPostProcessAction bcc (producer) Sets the BCC email address. Separate multiple email addresses with comma. String cc (producer) Sets the CC email address. Separate multiple email addresses with comma. String from (producer) The from email address. camel@localhost String lazyStartProducer (producer) Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false boolean replyTo (producer) The Reply-To recipients (the receivers of the response mail). Separate multiple email addresses with a comma. String subject (producer) The Subject of the message being sent. Note: Setting the subject in the header takes precedence over this option. String to (producer) Sets the To email address. Separate multiple email addresses with comma. String javaMailSender (producer (advanced)) To use a custom org.apache.camel.component.mail.JavaMailSender for sending emails. JavaMailSender additionalJavaMailProperties (advanced) Sets additional java mail properties, that will append/override any default properties that is set based on all the other options. This is useful if you need to add some special options but want to keep the others as is. Properties alternativeBodyHeader (advanced) Specifies the key to an IN message header that contains an alternative email body. For example, if you send emails in text/html format and want to provide an alternative mail body for non-HTML email clients, set the alternative mail body with this key as a header. CamelMailAlternativeBody String attachmentsContentTransferEncodingResolver (advanced) To use a custom AttachmentsContentTransferEncodingResolver to resolve what content-type-encoding to use for attachments. AttachmentsContentTransferEncodingResolver authenticator (advanced) The authenticator for login. If set then the password and username are ignored. Can be used for tokens which can expire and therefore must be read dynamically. MailAuthenticator binding (advanced) Sets the binding used to convert from a Camel message to and from a Mail message. MailBinding connectionTimeout (advanced) The connection timeout in milliseconds. 30000 int contentType (advanced) The mail message content type. Use text/html for HTML mails. text/plain String contentTypeResolver (advanced) Resolver to determine Content-Type for file attachments. ContentTypeResolver debugMode (advanced) Enable debug mode on the underlying mail framework. The SUN Mail framework logs the debug messages to System.out by default. false boolean headerFilterStrategy (advanced) To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter headers. HeaderFilterStrategy ignoreUnsupportedCharset (advanced) Option to let Camel ignore unsupported charset in the local JVM when sending mails. If the charset is unsupported then charset=XXX (where XXX represents the unsupported charset) is removed from the content-type and it relies on the platform default instead. false boolean ignoreUriScheme (advanced) Option to let Camel ignore unsupported charset in the local JVM when sending mails. If the charset is unsupported then charset=XXX (where XXX represents the unsupported charset) is removed from the content-type and it relies on the platform default instead. false boolean javaMailProperties (advanced) Sets the java mail options. Will clear any default properties and only use the properties provided for this method. Properties session (advanced) Specifies the mail session that camel should use for all mail interactions. Useful in scenarios where mail sessions are created and managed by some other resource, such as a JavaEE container. When using a custom mail session, then the hostname and port from the mail session will be used (if configured on the session). Session useInlineAttachments (advanced) Whether to use disposition inline or attachment. false boolean idempotentRepository (filter) A pluggable repository org.apache.camel.spi.IdempotentRepository which allows to cluster consuming from the same mailbox, and let the repository coordinate whether a mail message is valid for the consumer to process. By default no repository is in use. IdempotentRepository idempotentRepositoryRemoveOnCommit (filter) When using idempotent repository, then when the mail message has been successfully processed and is committed, should the message id be removed from the idempotent repository (default) or be kept in the repository. By default its assumed the message id is unique and has no value to be kept in the repository, because the mail message will be marked as seen/moved or deleted to prevent it from being consumed again. And therefore having the message id stored in the idempotent repository has little value. However this option allows to store the message id, for whatever reason you may have. true boolean searchTerm (filter) Refers to a javax.mail.search.SearchTerm which allows to filter mails based on search criteria such as subject, body, from, sent after a certain date etc. SearchTerm backoffErrorThreshold (scheduler) The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in. int backoffIdleThreshold (scheduler) The number of subsequent idle polls that should happen before the backoffMultipler should kick-in. int backoffMultiplier (scheduler) To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured. int delay (scheduler) Milliseconds before the poll. 60000 long greedy (scheduler) If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the run polled 1 or more messages. false boolean initialDelay (scheduler) Milliseconds before the first poll starts. 1000 long repeatCount (scheduler) Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever. 0 long runLoggingLevel (scheduler) The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that. Enum values: TRACE DEBUG INFO WARN ERROR OFF TRACE LoggingLevel scheduledExecutorService (scheduler) Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool. ScheduledExecutorService scheduler (scheduler) To use a cron scheduler from either camel-spring or camel-quartz component. Use value spring or quartz for built in scheduler. none Object schedulerProperties (scheduler) To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler. Map startScheduler (scheduler) Whether the scheduler should be auto started. true boolean timeUnit (scheduler) Time unit for initialDelay and delay options. Enum values: NANOSECONDS MICROSECONDS MILLISECONDS SECONDS MINUTES HOURS DAYS MILLISECONDS TimeUnit useFixedDelay (scheduler) Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details. true boolean password (security) The password for login. See also setAuthenticator(MailAuthenticator). String sslContextParameters (security) To configure security using SSLContextParameters. SSLContextParameters username (security) The username for login. See also setAuthenticator(MailAuthenticator). String sortTerm (sort) Sorting order for messages. Only natively supported for IMAP. Emulated to some degree when using POP3 or when IMAP server does not have the SORT capability. SortTerm[] 38.4.3. Sample endpoints Typically, you specify a URI with login credentials as follows (taking SMTP as an example): Alternatively, it is possible to specify both the user name and the password as query options: For example: 38.4.4. Component alias names IMAP IMAPs POP3s SMTP SMTPs 38.4.5. Default ports Default port numbers are supported. If the port number is omitted, Camel determines the port number to use based on the protocol. Protocol Default Port Number SMTP 25 SMTPS 465 POP3 110 POP3S 995 IMAP 143 IMAPS 993 38.5. SSL support The underlying mail framework is responsible for providing SSL support. You may either configure SSL/TLS support by completely specifying the necessary Java Mail API configuration options, or you may provide a configured SSLContextParameters through the component or endpoint configuration. 38.5.1. Using the JSSE Configuration Utility The mail component supports SSL/TLS configuration through the Camel JSSE Configuration Utility . This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the mail component. Programmatic configuration of the endpoint KeyStoreParameters ksp = new KeyStoreParameters(); ksp.setResource("/users/home/server/truststore.jks"); ksp.setPassword("keystorePassword"); TrustManagersParameters tmp = new TrustManagersParameters(); tmp.setKeyStore(ksp); SSLContextParameters scp = new SSLContextParameters(); scp.setTrustManagers(tmp); Registry registry = ... registry.bind("sslContextParameters", scp); ... from(...) .to("smtps://smtp.google.com?username=user@gmail.com&password=password&sslContextParameters=#sslContextParameters"); Spring DSL based configuration of endpoint ... <camel:sslContextParameters id="sslContextParameters"> <camel:trustManagers> <camel:keyStore resource="/users/home/server/truststore.jks" password="keystorePassword"/> </camel:trustManagers> </camel:sslContextParameters>... ... <to uri="smtps://smtp.google.com?username=user@gmail.com&password=password&sslContextParameters=#sslContextParameters"/>... 38.5.2. Configuring JavaMail Directly Camel uses Jakarta JavaMail, which only trusts certificates issued by well known Certificate Authorities (the default JVM trust configuration). If you issue your own certificates, you have to import the CA certificates into the JVM's Java trust/key store files, override the default JVM trust/key store files (see SSLNOTES.txt in JavaMail for details). 38.6. Mail Message Content Camel uses the message exchange's IN body as the MimeMessage text content. The body is converted to String.class. Camel copies all of the exchange's IN headers to the MimeMessage headers. The subject of the MimeMessage can be configured using a header property on the IN message. The code below demonstrates this: The same applies for other MimeMessage headers such as recipients, so you can use a header property as To: When using the MailProducer the send the mail to server, you should be able to get the message id of the MimeMessage with the key CamelMailMessageId from the Camel message header. 38.7. Headers take precedence over pre-configured recipients The recipients specified in the message headers always take precedence over recipients pre-configured in the endpoint URI. The idea is that if you provide any recipients in the message headers, that is what you get. The recipients pre-configured in the endpoint URI are treated as a fallback. In the sample code below, the email message is sent to davsclaus@apache.org , because it takes precedence over the pre-configured recipient, info@mycompany.com . Any CC and BCC settings in the endpoint URI are also ignored and those recipients will not receive any mail. The choice between headers and pre-configured settings is all or nothing: the mail component either takes the recipients exclusively from the headers or exclusively from the pre-configured settings. It is not possible to mix and match headers and pre-configured settings. Map<String, Object> headers = new HashMap<String, Object>(); headers.put("to", "davsclaus@apache.org"); template.sendBodyAndHeaders("smtp://admin@localhost?to=info@mycompany.com", "Hello World", headers); 38.8. Multiple recipients for easier configuration It is possible to set multiple recipients using a comma-separated or a semicolon-separated list. This applies both to header settings and to settings in an endpoint URI. For example: Map<String, Object> headers = new HashMap<String, Object>(); headers.put("to", "davsclaus@apache.org ; jstrachan@apache.org ; ningjiang@apache.org"); The preceding example uses a semicolon, ; , as the separator character. 38.9. Setting sender name and email You can specify recipients in the format, name <email> , to include both the name and the email address of the recipient. For example, you define the following headers on the a Message: Map headers = new HashMap(); map.put("To", "Claus Ibsen <davsclaus@apache.org>"); map.put("From", "James Strachan <jstrachan@apache.org>"); map.put("Subject", "Camel is cool"); 38.10. JavaMail API (ex SUN JavaMail) JavaMail API is used under the hood for consuming and producing mails. We encourage end-users to consult these references when using either POP3 or IMAP protocol. Note particularly that POP3 has a much more limited set of features than IMAP. JavaMail POP3 API JavaMail IMAP API And generally about the MAIL Flags 38.11. Samples We start with a simple route that sends the messages received from a JMS queue as emails. The email account is the admin account on mymailserver.com . from("jms://queue:subscription").to("smtp://admin@mymailserver.com?password=secret"); In the sample, we poll a mailbox for new emails once every minute. from("imap://admin@mymailserver.com?password=secret&unseen=true&delay=60000") .to("seda://mails"); 38.12. Sending mail with attachment sample Note Attachments are not support by all Camel components The Attachments API is based on the Java Activation Framework and is generally only used by the Mail API. Since many of the other Camel components do not support attachments, the attachments could potentially be lost as they propagate along the route. The rule of thumb, therefore, is to add attachments just before sending a message to the mail endpoint. The mail component supports attachments. In the sample below, we send a mail message containing a plain text message with a logo file attachment. 38.13. SSL sample In this sample, we want to poll our Google mail inbox for mails. To download mail onto a local mail client, Google mail requires you to enable and configure SSL. This is done by logging into your Google mail account and changing your settings to allow IMAP access. Google have extensive documentation on how to do this. from("imaps://imap.gmail.com?username=YOUR_USERNAME@gmail.com&password=YOUR_PASSWORD" + "&delete=false&unseen=true&delay=60000").to("log:newmail"); The preceding route polls the Google mail inbox for new mails once every minute and logs the received messages to the newmail logger category. Running the sample with DEBUG logging enabled, we can monitor the progress in the logs: 2008-05-08 06:32:09,640 DEBUG MailConsumer - Connecting to MailStore imaps//imap.gmail.com:993 (SSL enabled), folder=INBOX 2008-05-08 06:32:11,203 DEBUG MailConsumer - Polling mailfolder: imaps//imap.gmail.com:993 (SSL enabled), folder=INBOX 2008-05-08 06:32:11,640 DEBUG MailConsumer - Fetching 1 messages. Total 1 messages. 2008-05-08 06:32:12,171 DEBUG MailConsumer - Processing message: messageNumber=[332], from=[James Bond <007@mi5.co.uk>], to=YOUR_USERNAME@gmail.com], subject=[... 2008-05-08 06:32:12,187 INFO newmail - Exchange[MailMessage: messageNumber=[332], from=[James Bond <007@mi5.co.uk>], to=YOUR_USERNAME@gmail.com], subject=[... 38.14. Consuming mails with attachment sample In this sample we poll a mailbox and store all attachments from the mails as files. First, we define a route to poll the mailbox. As this sample is based on google mail, it uses the same route as shown in the SSL sample: from("imaps://imap.gmail.com?username=YOUR_USERNAME@gmail.com&password=YOUR_PASSWORD" + "&delete=false&unseen=true&delay=60000").process(new MyMailProcessor()); Instead of logging the mail we use a processor where we can process the mail from java code: public void process(Exchange exchange) throws Exception { // the API is a bit clunky so we need to loop AttachmentMessage attachmentMessage = exchange.getMessage(AttachmentMessage.class); Map<String, DataHandler> attachments = attachmentMessage.getAttachments(); if (attachments.size() > 0) { for (String name : attachments.keySet()) { DataHandler dh = attachments.get(name); // get the file name String filename = dh.getName(); // get the content and convert it to byte[] byte[] data = exchange.getContext().getTypeConverter() .convertTo(byte[].class, dh.getInputStream()); // write the data to a file FileOutputStream out = new FileOutputStream(filename); out.write(data); out.flush(); out.close(); } } } As you can see the API to handle attachments is a bit clunky but it's there so you can get the javax.activation.DataHandler so you can handle the attachments using standard API. 38.15. How to split a mail message with attachments In this example we consume mail messages which may have a number of attachments. What we want to do is to use the Splitter EIP per individual attachment, to process the attachments separately. For example if the mail message has 5 attachments, we want the Splitter to process five messages, each having a single attachment. To do this we need to provide a custom Expression to the Splitter where we provide a List<Message> that contains the five messages with the single attachment. The code is provided out of the box in Camel 2.10 onwards in the camel-mail component. The code is in the class: org.apache.camel.component.mail.SplitAttachmentsExpression , which you can find in the source code here . In the Camel route you then need to use this Expression in the route as shown below: If you use XML DSL then you need to declare a method call expression in the Splitter as shown below <split> <method beanType="org.apache.camel.component.mail.SplitAttachmentsExpression"/> <to uri="mock:split"/> </split> You can also split the attachments as byte[] to be stored as the message body. This is done by creating the expression with boolean true SplitAttachmentsExpression split = SplitAttachmentsExpression(true); And then use the expression with the splitter EIP. 38.16. Using custom SearchTerm You can configure a searchTerm on the MailEndpoint which allows you to filter out unwanted mails. For example to filter mails to contain Camel in either Subject or Text you can do as follows: <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm.subjectOrBody=Camel"/> <to uri="bean:myBean"/> </route> Notice we use the "searchTerm.subjectOrBody" as parameter key to indicate that we want to search on mail subject or body, to contain the word "Camel". The class org.apache.camel.component.mail.SimpleSearchTerm has a number of options you can configure: Or to get the new unseen emails going 24 hours back in time you can do. Notice the "now-24h" syntax. See the table below for more details. <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm.fromSentDate=now-24h"/> <to uri="bean:myBean"/> </route> You can have multiple searchTerm in the endpoint uri configuration. They would then be combined together using AND operator, eg so both conditions must match. For example to get the last unseen emails going back 24 hours which has Camel in the mail subject you can do: <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm.subject=Camel&searchTerm.fromSentDate=now-24h"/> <to uri="bean:myBean"/> </route> The SimpleSearchTerm is designed to be easily configurable from a POJO, so you can also configure it using a <bean> style in XML <bean id="mySearchTerm" class="org.apache.camel.component.mail.SimpleSearchTerm"> <property name="subject" value="Order"/> <property name="to" value="acme-order@acme.com"/> <property name="fromSentDate" value="now"/> </bean> You can then refer to this bean, using #beanId in your Camel route as shown: <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm=#mySearchTerm"/> <to uri="bean:myBean"/> </route> In Java there is a builder class to build compound SearchTerms using the org.apache.camel.component.mail.SearchTermBuilder class. This allows you to build complex terms such as: // we just want the unseen mails which is not spam SearchTermBuilder builder = new SearchTermBuilder(); builder.unseen().body(Op.not, "Spam").subject(Op.not, "Spam") // which was sent from either foo or bar .from("foo@somewhere.com").from(Op.or, "bar@somewhere.com"); // .. and we could continue building the terms SearchTerm term = builder.build(); 38.17. Polling Optimization The parameter maxMessagePerPoll and fetchSize allow you to restrict the number message that should be processed for each poll. These parameters should help to prevent bad performance when working with folders that contain a lot of messages. In versions these parameters have been evaluated too late, so that big mailboxes could still cause performance problems. With Camel 3.1 these parameters are evaluated earlier during the poll to avoid these problems. 38.18. Using headers with additional Java Mail Sender properties When sending mails, then you can provide dynamic java mail properties for the JavaMailSender from the Exchange as message headers with keys starting with java.smtp. . You can set any of the java.smtp properties which you can find in the Java Mail documentation. For example to provide a dynamic uuid in java.smtp.from (SMTP MAIL command): .setHeader("from", constant("reply2me@foo.com")); .setHeader("java.smtp.from", method(UUID.class, "randomUUID")); .to("smtp://mymailserver:1234"); Note This is only supported when not using a custom JavaMailSender . 38.19. Spring Boot Auto-Configuration When using imap with Spring Boot make sure to use the following Maven dependency to have support for auto configuration: <dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-mail-starter</artifactId> </dependency> The component supports 50 options, which are listed below. Name Description Default Type camel.component.mail.additional-java-mail-properties Sets additional java mail properties, that will append/override any default properties that is set based on all the other options. This is useful if you need to add some special options but want to keep the others as is. The option is a java.util.Properties type. Properties camel.component.mail.alternative-body-header Specifies the key to an IN message header that contains an alternative email body. For example, if you send emails in text/html format and want to provide an alternative mail body for non-HTML email clients, set the alternative mail body with this key as a header. CamelMailAlternativeBody String camel.component.mail.attachments-content-transfer-encoding-resolver To use a custom AttachmentsContentTransferEncodingResolver to resolve what content-type-encoding to use for attachments. The option is a org.apache.camel.component.mail.AttachmentsContentTransferEncodingResolver type. AttachmentsContentTransferEncodingResolver camel.component.mail.authenticator The authenticator for login. If set then the password and username are ignored. Can be used for tokens which can expire and therefore must be read dynamically. The option is a org.apache.camel.component.mail.MailAuthenticator type. MailAuthenticator camel.component.mail.autowired-enabled Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true Boolean camel.component.mail.bcc Sets the BCC email address. Separate multiple email addresses with comma. String camel.component.mail.bridge-error-handler Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false Boolean camel.component.mail.cc Sets the CC email address. Separate multiple email addresses with comma. String camel.component.mail.close-folder Whether the consumer should close the folder after polling. Setting this option to false and having disconnect=false as well, then the consumer keep the folder open between polls. true Boolean camel.component.mail.configuration Sets the Mail configuration. The option is a org.apache.camel.component.mail.MailConfiguration type. MailConfiguration camel.component.mail.connection-timeout The connection timeout in milliseconds. 30000 Integer camel.component.mail.content-type The mail message content type. Use text/html for HTML mails. text/plain String camel.component.mail.content-type-resolver Resolver to determine Content-Type for file attachments. The option is a org.apache.camel.component.mail.ContentTypeResolver type. ContentTypeResolver camel.component.mail.copy-to After processing a mail message, it can be copied to a mail folder with the given name. You can override this configuration value, with a header with the key copyTo, allowing you to copy messages to folder names configured at runtime. String camel.component.mail.debug-mode Enable debug mode on the underlying mail framework. The SUN Mail framework logs the debug messages to System.out by default. false Boolean camel.component.mail.decode-filename If set to true, the MimeUtility.decodeText method will be used to decode the filename. This is similar to setting JVM system property mail.mime.encodefilename. false Boolean camel.component.mail.delete Deletes the messages after they have been processed. This is done by setting the DELETED flag on the mail message. If false, the SEEN flag is set instead. As of Camel 2.10 you can override this configuration option by setting a header with the key delete to determine if the mail should be deleted or not. false Boolean camel.component.mail.disconnect Whether the consumer should disconnect after polling. If enabled this forces Camel to connect on each poll. false Boolean camel.component.mail.enabled Whether to enable auto configuration of the mail component. This is enabled by default. Boolean camel.component.mail.fetch-size Sets the maximum number of messages to consume during a poll. This can be used to avoid overloading a mail server, if a mailbox folder contains a lot of messages. Default value of -1 means no fetch size and all messages will be consumed. Setting the value to 0 is a special corner case, where Camel will not consume any messages at all. -1 Integer camel.component.mail.folder-name The folder to poll. INBOX String camel.component.mail.from The from email address. camel@localhost String camel.component.mail.handle-failed-message If the mail consumer cannot retrieve a given mail message, then this option allows to handle the caused exception by the consumer's error handler. By enable the bridge error handler on the consumer, then the Camel routing error handler can handle the exception instead. The default behavior would be the consumer throws an exception and no mails from the batch would be able to be routed by Camel. false Boolean camel.component.mail.header-filter-strategy To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter header to and from Camel message. The option is a org.apache.camel.spi.HeaderFilterStrategy type. HeaderFilterStrategy camel.component.mail.ignore-unsupported-charset Option to let Camel ignore unsupported charset in the local JVM when sending mails. If the charset is unsupported then charset=XXX (where XXX represents the unsupported charset) is removed from the content-type and it relies on the platform default instead. false Boolean camel.component.mail.ignore-uri-scheme Option to let Camel ignore unsupported charset in the local JVM when sending mails. If the charset is unsupported then charset=XXX (where XXX represents the unsupported charset) is removed from the content-type and it relies on the platform default instead. false Boolean camel.component.mail.java-mail-properties Sets the java mail options. Will clear any default properties and only use the properties provided for this method. The option is a java.util.Properties type. Properties camel.component.mail.java-mail-sender To use a custom org.apache.camel.component.mail.JavaMailSender for sending emails. The option is a org.apache.camel.component.mail.JavaMailSender type. JavaMailSender camel.component.mail.lazy-start-producer Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false Boolean camel.component.mail.map-mail-message Specifies whether Camel should map the received mail message to Camel body/headers/attachments. If set to true, the body of the mail message is mapped to the body of the Camel IN message, the mail headers are mapped to IN headers, and the attachments to Camel IN attachment message. If this option is set to false then the IN message contains a raw javax.mail.Message. You can retrieve this raw message by calling exchange.getIn().getBody(javax.mail.Message.class). true Boolean camel.component.mail.mime-decode-headers This option enables transparent MIME decoding and unfolding for mail headers. false Boolean camel.component.mail.move-to After processing a mail message, it can be moved to a mail folder with the given name. You can override this configuration value, with a header with the key moveTo, allowing you to move messages to folder names configured at runtime. String camel.component.mail.password The password for login. See also setAuthenticator(MailAuthenticator). String camel.component.mail.peek Will mark the javax.mail.Message as peeked before processing the mail message. This applies to IMAPMessage messages types only. By using peek the mail will not be eager marked as SEEN on the mail server, which allows us to rollback the mail message if there is an error processing in Camel. true Boolean camel.component.mail.reply-to The Reply-To recipients (the receivers of the response mail). Separate multiple email addresses with a comma. String camel.component.mail.session Specifies the mail session that camel should use for all mail interactions. Useful in scenarios where mail sessions are created and managed by some other resource, such as a JavaEE container. When using a custom mail session, then the hostname and port from the mail session will be used (if configured on the session). The option is a javax.mail.Session type. Session camel.component.mail.skip-failed-message If the mail consumer cannot retrieve a given mail message, then this option allows to skip the message and move on to retrieve the mail message. The default behavior would be the consumer throws an exception and no mails from the batch would be able to be routed by Camel. false Boolean camel.component.mail.ssl-context-parameters To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type. SSLContextParameters camel.component.mail.subject The Subject of the message being sent. Note: Setting the subject in the header takes precedence over this option. String camel.component.mail.to Sets the To email address. Separate multiple email addresses with comma. String camel.component.mail.unseen Whether to limit by unseen mails only. true Boolean camel.component.mail.use-global-ssl-context-parameters Enable usage of global SSL context parameters. false Boolean camel.component.mail.use-inline-attachments Whether to use disposition inline or attachment. false Boolean camel.component.mail.username The username for login. See also setAuthenticator(MailAuthenticator). String camel.dataformat.mime-multipart.binary-content Defines whether the content of binary parts in the MIME multipart is binary (true) or Base-64 encoded (false) Default is false. false Boolean camel.dataformat.mime-multipart.enabled Whether to enable auto configuration of the mime-multipart data format. This is enabled by default. Boolean camel.dataformat.mime-multipart.headers-inline Defines whether the MIME-Multipart headers are part of the message body (true) or are set as Camel headers (false). Default is false. false Boolean camel.dataformat.mime-multipart.include-headers A regex that defines which Camel headers are also included as MIME headers into the MIME multipart. This will only work if headersInline is set to true. Default is to include no headers. String camel.dataformat.mime-multipart.multipart-sub-type Specify the subtype of the MIME Multipart. Default is mixed. mixed String camel.dataformat.mime-multipart.multipart-without-attachment Defines whether a message without attachment is also marshaled into a MIME Multipart (with only one body part). Default is false. false Boolean
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-mail</artifactId> <version>{CamelSBVersion}</version> <!-- use the same version as your Camel core version --> </dependency> smtp://[username@]host[:port][?options] pop3://[username@]host[:port][?options] imap://[username@]host[:port][?options] smtps://[username@]host[:port][?options] pop3s://[username@]host[:port][?options] imaps://[username@]host[:port][?options] imap:host:port smtp://[username@]host[:port][?password=somepwd] smtp://host[:port]?password=somepwd&username=someuser smtp://mycompany.mailserver:30?password=tiger&username=scott KeyStoreParameters ksp = new KeyStoreParameters(); ksp.setResource("/users/home/server/truststore.jks"); ksp.setPassword("keystorePassword"); TrustManagersParameters tmp = new TrustManagersParameters(); tmp.setKeyStore(ksp); SSLContextParameters scp = new SSLContextParameters(); scp.setTrustManagers(tmp); Registry registry = registry.bind("sslContextParameters", scp); from(...) .to("smtps://smtp.google.com?username=user@gmail.com&password=password&sslContextParameters=#sslContextParameters"); <camel:sslContextParameters id="sslContextParameters"> <camel:trustManagers> <camel:keyStore resource="/users/home/server/truststore.jks" password="keystorePassword"/> </camel:trustManagers> </camel:sslContextParameters> <to uri="smtps://smtp.google.com?username=user@gmail.com&password=password&sslContextParameters=#sslContextParameters"/> Map<String, Object> headers = new HashMap<String, Object>(); headers.put("to", "davsclaus@apache.org"); template.sendBodyAndHeaders("smtp://admin@localhost?to=info@mycompany.com", "Hello World", headers); Map<String, Object> headers = new HashMap<String, Object>(); headers.put("to", "davsclaus@apache.org ; jstrachan@apache.org ; ningjiang@apache.org"); Map headers = new HashMap(); map.put("To", "Claus Ibsen <davsclaus@apache.org>"); map.put("From", "James Strachan <jstrachan@apache.org>"); map.put("Subject", "Camel is cool"); from("jms://queue:subscription").to("smtp://admin@mymailserver.com?password=secret"); from("imap://admin@mymailserver.com?password=secret&unseen=true&delay=60000") .to("seda://mails"); from("imaps://imap.gmail.com?username=YOUR_USERNAME@gmail.com&password=YOUR_PASSWORD" + "&delete=false&unseen=true&delay=60000").to("log:newmail"); 2008-05-08 06:32:09,640 DEBUG MailConsumer - Connecting to MailStore imaps//imap.gmail.com:993 (SSL enabled), folder=INBOX 2008-05-08 06:32:11,203 DEBUG MailConsumer - Polling mailfolder: imaps//imap.gmail.com:993 (SSL enabled), folder=INBOX 2008-05-08 06:32:11,640 DEBUG MailConsumer - Fetching 1 messages. Total 1 messages. 2008-05-08 06:32:12,171 DEBUG MailConsumer - Processing message: messageNumber=[332], from=[James Bond <007@mi5.co.uk>], to=YOUR_USERNAME@gmail.com], subject=[ 2008-05-08 06:32:12,187 INFO newmail - Exchange[MailMessage: messageNumber=[332], from=[James Bond <007@mi5.co.uk>], to=YOUR_USERNAME@gmail.com], subject=[ from("imaps://imap.gmail.com?username=YOUR_USERNAME@gmail.com&password=YOUR_PASSWORD" + "&delete=false&unseen=true&delay=60000").process(new MyMailProcessor()); public void process(Exchange exchange) throws Exception { // the API is a bit clunky so we need to loop AttachmentMessage attachmentMessage = exchange.getMessage(AttachmentMessage.class); Map<String, DataHandler> attachments = attachmentMessage.getAttachments(); if (attachments.size() > 0) { for (String name : attachments.keySet()) { DataHandler dh = attachments.get(name); // get the file name String filename = dh.getName(); // get the content and convert it to byte[] byte[] data = exchange.getContext().getTypeConverter() .convertTo(byte[].class, dh.getInputStream()); // write the data to a file FileOutputStream out = new FileOutputStream(filename); out.write(data); out.flush(); out.close(); } } } <split> <method beanType="org.apache.camel.component.mail.SplitAttachmentsExpression"/> <to uri="mock:split"/> </split> SplitAttachmentsExpression split = SplitAttachmentsExpression(true); <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm.subjectOrBody=Camel"/> <to uri="bean:myBean"/> </route> <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm.fromSentDate=now-24h"/> <to uri="bean:myBean"/> </route> <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm.subject=Camel&searchTerm.fromSentDate=now-24h"/> <to uri="bean:myBean"/> </route> <bean id="mySearchTerm" class="org.apache.camel.component.mail.SimpleSearchTerm"> <property name="subject" value="Order"/> <property name="to" value="acme-order@acme.com"/> <property name="fromSentDate" value="now"/> </bean> <route> <from uri="imaps://mymailseerver?username=foo&password=secret&searchTerm=#mySearchTerm"/> <to uri="bean:myBean"/> </route> // we just want the unseen mails which is not spam SearchTermBuilder builder = new SearchTermBuilder(); builder.unseen().body(Op.not, "Spam").subject(Op.not, "Spam") // which was sent from either foo or bar .from("foo@somewhere.com").from(Op.or, "bar@somewhere.com"); // .. and we could continue building the terms SearchTerm term = builder.build(); .setHeader("from", constant("reply2me@foo.com")); .setHeader("java.smtp.from", method(UUID.class, "randomUUID")); .to("smtp://mymailserver:1234"); <dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-mail-starter</artifactId> </dependency>