If you are using AWS SES you need to make sure you validate the account first:
http://docs.aws.amazon.com/ses/latest/DeveloperGuide/verify-email-addresses.html
With the exception of addresses containing labels (see below), you must verify each email address that will be used as a "From" or "Return-Path" address for your messages.
The entire email address is case-sensitive. For example, if you verify [email protected], you cannot send emails from [email protected] unless you verify [email protected] also. (Domain verification, however, is case-insensitive. For more information, see Verifying Domains in Amazon SES.)
Until you are granted production access to Amazon SES, you must also verify the email address of every recipient except for the recipients provided by the Amazon SES mailbox simulator. For more information about the mailbox simulator, see Testing Amazon SES Email Sending. For more information about production access, see Requesting Production Access to Amazon SES.