Silently bouncing messages mean messages can get lost. For example, when I fetch manually, I can see this:
fetchmail: SMTP error: 550 maximum allowed line length is 998 octets, got 1006 fetchmail: mail from MAILER-DAEMON@<host> bounced to <sender> fetchmail: SMTP listener refused delivery If fetchmail is running as daemon like it usually is, I get no indication that I missed a message. At the very least, in failures like this, fetchmail should send its error messages through as an email, including the subject and sender, so that the user knows they missed a message and can investigate.
