Improve support for Multipart emails in wp_mail
completed by: Ryan McCue
mentors: Peter Westwood
wp_mail doesn't support multipart emails very well.
The following trac ticket suggests ways in which this can be improved
http://core.trac.wordpress.org/ticket/15448
To completely this task you should work on a solution to this problem.
Implementation detail questions should be posted on the trac ticket so that the community can have input.