Add HTML-escaping to code examples in rST tempate of module-formatter
 Add support for specifying port, addresses with phrases and attaching files
 Add support for custom headers and document version_added for new options
 X-Mailer header added :)
 protect empty address lists & attachment list, and add bcc

Sending mails could be part of the workflow to have teams/responsibles perform specific task. Or simply to notify that a process has finished successfully (e.g. provisioning).