Sendmail error: Deferred: Bad file descriptor when delivering some messages

[Oscar Olsson]

Hi!

I've noticed a quite annoying problem with my cyrus setup. Some messages
get delivered, but sendmail sees it as a delivery failure, and sends a
4XX error to the sending SMTP server/client. This makes the sending
server/client retry the send, which ofcourse produces the same error
again, and then another copy of the message appears in the users
mailbox. This happens again and again until the users mailbox gets over
quota.

I'd like to know what's causing this. It seems like its only some
messages that produce this error. Other messages get delivered just fine
with no error. (!?) Full headers of these "failed" messages can be
obtained upon request. Yes, I have tried running "reconstruct -r" on the
mailbox.

Environment: Linux slackware
Sendmail 8.12.1 - compiled from source on the local cyrus server
Cyrus 2.0.17 - compiled from source on the local cyrus server

Sendmail and cyrus have been compiled with SASL support and sendmail
also has SMTP AUTH support compiled in, however I doubt that this has
anything to do with the problem.

>From the maillog:

Nov 12 14:31:09 e2home-imap sendmail[846]: hAABDDkt012554:
to=<someuser at e2HomeGate.com>, delay=2+02:17:56, xdelay=00:00:00,
mailer=cyrus, pri=18213656, relay=localhost [[UNIX:
/var/imap/socket/lmtp]], dsn=4.4.2, stat=Deferred: Bad file descriptor

If I forward the same message, it gets delivered without any problems.

imapd.log doesn't have any clues either.

Does anyone recognize this error? Is it an lmtp bug och a sendmail
bug/malfunction? Any clues on what may be causing this? I appreciate all
feedback I can get right now. :/

//Oscar