I recently looked into a problem that has been plaguing me since the switch to dovecot a couple of years back, documented here: http://mailman.rwth-aachen.de/pipermail/procmail/2006-May/024363.html
The gist is that when I tell Outlook 2000 to write all outgoing mail into a Sent-mail folder on the IMAP server (using mbox format), I find that the mbox's don't have empty lines separating the messages, (though the Content-Length field is correct. This leads to interoperability problems with programs and scripts that expect each mbox message to be separated by an empty line.
(We're running dovecot-1.0-0.beta2.7 under Fedora Core 5 on an x86_64 platform.)
Has this mbox behavior been reported before? Is it considered a bug or a feature? Is there a configuration option, or Outlook tweak, that can be enabled to ensure that the mbox's produced by writing messages to them via Outlook, are well-formed (have an empty line separating messages)?