For a while now I've been noticing that some of the mail I've been sent has been going missing. It was highlighted because a couple of mails from friends got forwarded to my work mail address, but never hit my personal mailbox. After trawling through the logs and adding some monitoring, I discovered the culprint was a comment character '#' had been replaced with an asterisk '*' in my .procmailrc file.
It turns out the fault is actually with the online Tesla Gwynne's procmail config file, that I originally used as a starting point. If you look at line 374, towards the end, you should spot it.
Now to email the webmaster with a patch :)