For some reason, procmail seems to be sporadically losing messages into thin air. Only a few messages are being lost, but they are important messages (as opposed to spam). I can see the specific message subjects and sender addresses in the procmail.log file, but not in the mailbox file. The mailbox file contains messages from several days before and after the missing message date.
I am preparing to implement both Amavis-Postfix/ClamAV and SpamAssassin scanning on this mail server, so procmail will be required. Was there an issue with the previous version of procmail that might have caused this? I just upgraded that server today to Woody. As of right now, there is no /etc/procmailrc file and the .procmailrc file is simply: LOGFILE=$HOME/procmail.log