In a recent post to his blog Ian Christian has written up an example of how to send a multipart email from a Task inside your Symfony application.

I recently needed to send the result of an action in symfony via email daily. E-mail has changed slightly in symfony 1.3/1.4 - here's how I did it. I really don't like my solution at all, the use of get_partial() from within a Task seems very wrong to me - but I'm in a rush so it will do for now, I'd love to hear feedback.

His class extends the sfBaseTask and sets up an execute method that builds a database connection, fetches a few rows and, with a newly created mailer instance, sends the information using the get_partial method to define both HTML and text content parts of the email.