1. A method for processing email, the method comprising: receiving email capture criteria for incoming email messages directed to a destination tenant of a multi-tenant database system, each of the incoming email messages having a recipient address ending with a common domain string that corresponds to the multi-tenant database system, and the email capture criteria received in an email capture request that is valid for only one captured email message; comparing the email capture criteria to searchable information conveyed in the incoming email messages; when the searchable information in a candidate email message of the incoming email messages matches the email capture criteria by at least a threshold amount, identifying the candidate email message as a matched email message; saving a copy of the matched email message; performing incoming email processing on the matched email message; and after the matched email message has been detected, indicating that the email capture request is completed.