You cannot produce a multi-part plain text and HTML email. This means you can send decent mails and help them get through spam filters by avoiding obvious problems (eg HTML only mails). I've created the code for this feature and the last two bug reports - 34788 and 34786 but being a tad stupid and not having a clue about cvs I can't work out how to get the patches from diffs of the current code. The code is downloadable from the URL supplied.
Resolving. Taglib has been retired.