I've added a few features to the 'mail' module [1] because I need them,
and hope you'll need them too 
1. Support for MIME attachments (content-type: octet/stream). This may
sound pretty crazy, but it goes like this: "Send me the file please".
2. Support for custom headers (inspired by Dag ranting about #1 on IRC
3. Support for specifying a non-standard SMTP port.
4. Support for specifying e-mail address with phrase portion (e.g.
"John Doe <john@example.com>" for those mails that need to look good
to a manager.
An example playbook and output can be found at [1].
Regards,
-JP