anchor.diff:      }
       ```
   
  -## Group SMTP API
  +# Group SMTP API
   
   Through use of the X-MSYS-API header in a message sent to SparkPost through SMTP 
   (see ["Sending an Email"](https://www.sparkpost.com/docs/sending-email)), you can now specify a campaign id, metadata,
  
positive.code: 
  ```
  X-MSYS-API: {
  "cc" : [
     {
      "email" : "cc_recip_1@gmail.com",
      "name" : "CC 1"
     },
     {
      "email" : "cc_recip_2@gmail.com",
      "name" : "CC 2"
     }
  ]
  "bcc" : [
     {
      "email" : "bcc_recip_1@gmail.com",
      "name" : "BCC 1"
     }
  ]
  }
  ```
  
  SMTP defines a maximum line length of 1000 characters (including CRLF).  If the value of the X-MSYS-API JSON string is
  longer than 998 characters, it will need to be folded across multiple lines before the message is injected.  An example
  
negative.code: |-------|------|-------------|----------|-------|
  | campaign_id | string | Name of the campaign to associate with the SMTP message | no | Maximum length - 64 bytes (same restriction as the REST API) |
  | metadata | JSON object | JSON key value pairs associated with the SMTP message | no | A maximum of 200 bytes of metadata is available during click/open events. |
  | cc | JSON array | Array of recipient addresses that will be included in the Cc header (SparkPost.com only) | no | A unique message will be generated for each recipient in this list. |
  | bcc | JSON array | Array of recipient addresses that will be hidden from all other recipients (SparkPost.com only) | no | A unique message will be generated for each recipient in this list. |
  | archive | JSON array | Array of recipient addresses that will be hidden from all other recipients (SparkPost.com only) | no | A unique message will be generated for each recipient in this list. For a full description, see the section "**What is an archive recipient?**" |
  | tags | JSON array | Array of text labels associated with the SMTP message | no | Tags are available in click/open events. Maximum number of tags is 10 per recipient, 100 system wide. |
  | options | JSON object | JSON object in which SMTP API options are defined | no | For a full description, see the Options Attributes. |
  
  