Description: Known bugs and to-do items in fetchmail
Keywords: fetchmail, POP3, IMAP, bugs

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# Fetchmail Bugs and To-Do Items

I try to respond to urgent bug reports in a timely way. But fetchmail is now pretty mature and I have many other projects, so I don't personally chase obscure or marginal problems. Help with any of these will be cheerfully accepted.

Feature request from "Ralf G. R. Bergs" "When fetchmail downloads mail and Exim+SpamAssassin detecs an incoming message as spam, fetchmail tries to bounce it. Unfortunately it uses an incorrect hostname as part of the sender address (I've an internal LAN with private hostnames, plus an official IP address and hostname, and fetchmail picks the internal name of my host.) So I'd like to have a config statement that allows me to explicitly set a senderaddress for bounce messages."

POP3 can't presently distinguish a wedged or down server from an authentication failure. Possible fix: after issuing a PASS command. wait 300 (xx) seconds for a "-ERR" or a "+OK" . If nothing comes back, retry at the next poll event and generate no errors. If we get an -ERR then log an authentication failure.

It has been reported that multidrop name matching fails when the name to be matched contains a Latin-1 umlaut. Dollars to doughnuts this is some kind of character sign-extension problem. Trouble is, it's very likely in the BIND libraries. Someone should go in with a debugger and check this.

In the SSL support, add authentication of Certifying Authority (Is this a Certifying Authority we recognize?).

Debian wishlist item 181157: ssl key learning for self-signed certificates.

Laszlo Vecsey writes: "I believe qmail uses a technique of writing temporary files to nfs, and then moving them into place to ensure that they're written. Actually a hardlink is made to the temporary file and the destination name in a new directory, then the first one is unlinked.. maybe a combination of this will help with the fetchmail lock file."

Move everything to using service strings rather that port numbers, so we can get rid of ENABLE_INET6 everywhere but in SockOpen (this will get rid of the kluge in rcfile_y.y).

John Summerfield suggests that specifying a localname containing @ ought to be treated as an smtpname option, with the domain part removed for other purposes such as local-address matching.

The Debian bug-tracking page for fetchmail lists other bug reports.

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