Forum OpenACS Q&A: Re: What is wrong with "emailing" openAcs
Better would be to have some external program that is called by the MTA (through some mail processing agent or directly) that would take care of handling e-mail to OpenACS.
Personally I prefer Maildir + sweeper to something that tries to do direct inserts to the db (since I am more confident that mail won't be unaccountably dropped).
Also, I think the silent deletion and failure to track bounces was fixed by Mat Kovach.
And finally, it does in fact work (with the caveats about not being smart about attachments, quoted text, etc). For example dotlrn.org can accept incoming email to the forums. I would not be surprised though if there were bugs in the oracle version that have not been fixed.
see bug 1843 for the tracking bug.