I’m now using the Postie plugin to post to this blog by mail. I had to modify it, though, since it handles colons (:) in mail subjects in a fairly counterintuitive way: by assigning everything before the colon as the post category. Since it also supports the ability to specify category names in brackets ([SharePoint 2007], for instance, to post to that category), this meant that the colon processing incorrectly dropped that information. Thus, I had to edit the postie-functions.php
file and comment out lines 1507-1510, which control how colons are processed.
It seems to work fairly well, though plain text e-mails with breaks post weirdly. This post is testing the HTML formatting abilities, which should work perfectly.