So what happened to me was that I activated a crontab accidentally that fetchmails POP3 mail. It connects to localhost and delivers to me (pjp@localhost). In my case the lmtp delivery caused a no such mailbox error, and opensmtpd then sent a bounce to the originators of the mail as MAILER-DAEMON via the relay. How can I in future prevent this through the config?
Let fetchmail directly deliver to /var/imap/socket/lmtp should do the trick, because no bouncing smtpd is involved.
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