Hi all,
I am running an admittedly way-too-old version of Courier, 0.40.2 built as RPMs on RHEL 2.1.
Now, that may be the problem--"just upgrade." Reasonable, but if an upgrade isn't necessary then I would like to stay with what's been rock-solid for us for years and keep focused elsewhere.
Very, very rarely (but at least twice now), all of a sudden no (or very little) mail is arriving. That's not really possible as even I personally get lots of mail.
The logfile indicates occasional connection attempts from The Usual Suspects, and nothing really looks out of place. There's just very little to no mail hitting the server. That can't be.
mailq shows very little--the queue is almost empty and is normal.
I restart Courier (all modules).
Suddenly there is a FLOOD of activity in the maillog, with hundreds to thousands of messages arriving all at once. Sure enough my mailbox fills with hours-old messages that are now faithfully delivered.
Once again, there were no maillog lines indicating that any of these messages even arrived at all, until the restart. This all happens IMMEDIATELY upon restart--not as if other remote mail servers had queued up and now are re-trying, plus some of the mail is from my local servers.
It is as if they were held for hours at the TCP level or something (but not lost during a restart). I make such nonsensical statements for lack of better wording--it's just as if a whole bunch of mail was being held "somewhere" without even being logged as coming in the door yet.
We have most of our mail pre-scanned by Postini, so we get lots of connections from their IPs and I have maxdaemons, maxperc and maxip set quite high in esmtpd, even though there's rarely much stress on the server. Please note that plenty of the held mail was NOT inbound through Postini, so it is NOT simply the case that Postini was holding something or being mean.
Again, this happens very very rarely, but is troublesome enough (and requires human intervention) that I should probably get to the bottom of it. Yes, maybe I should work on a huge upgrade and Live in the Now.
But, I'm hoping that these symptoms sound very familiar to somebody and you might have a concrete diagnosis, as I REALLY don't want to mess with upgrading if that doesn't turn out to solve it.
Thanks very much for any help.
Cheers, Dan
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