The email-ext plugin can be configured to send emails with either HTML or plain text. It would be quite nice to have an option to send them as multipart messages containing both HTML and plain text.

My use case is sending HTML notification to a mailman mailing list. The mails are received just fine and show up nicely formatted.

Mailman archiver does not support HTML though, so it strip it out and only show the plain text content which is empty.

Example:

http://lists.wikimedia.org/pipermail/qa-alerts/2014-May/000005.html

shows:

An HTML attachment was scrubbed...
URL: <http://lists.wikimedia.org/pipermail/qa-alerts/attachments/20140521/0dc7bbc7/attachment.html>

Expected:

FAILURE whatever-job-here build #42
http://jenkins.example.com/ci/job/whatever-job-here/42

An HTML attachment was scrubbed...
URL: <http://lists.wikimedia.org/pipermail/qa-alerts/attachments/20140521/0dc7bbc7/attachment.html>

That would be a very nice addition to the plugin.