This may sound utterly silly, but within all these years, that I have been using procmail, I never came around to find a way of testing procmail rules other than by testing them in production for my incoming e-mail. The problem is, procmail gets called through sendmail and they deliver the messages. If I resend messages, sendmail changes the Return-Path header field, on which my rules are based. All other relevant looking header fields can get tweaked and faked, Return-Path seems alright (???).
Update / 2010-12-26:
Setting “VERBOSE=on” within your .procmailrc shows a lot of helpful output.
Yes, a message, that my .procmailrc does not deal with, as I think it should, must get copied to another IMAP folder; from there I copy it back to the IMAP folder, which I direct fetchmail to. I can repeat that endlessly, until I find out what’s going on. Maybe that also works somehow with formail, but I haven’t figured that out yet.
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