I'm glad to announce that attachment functionality with the forums now
works in all situations.
Previously, no attachments worked in the forums. Mailing list posts that
had attachments would find them stripped when they appeared on the
forum, and forum users were unable to attach posts via the file upload
mechanism. We hadn't encountered this problem when we first imported the
archives, but somewhere along the line, it surfaced. People who use the
mailing list exclusively were not affected, except for posts originating
on the forums. If you must gloat about this fact, please do so silently :-)
At some point, I'll do a post-by-post comparison with the mailman
archives, and will replace the missing attachments in the forum archives
where I find them missing.
Thank you all for your patience in this somewhat trivial, but highly
annoying at times, matter.