On Mon, 18 Apr 2005, Gordon Messmer wrote:
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.
It's not very solid if you're writing for advice on problems...
Good point, but running for 3-4 years with almost no problems to speak of (and millions of emails delivered) ain't too bad :)
Hats off to Mr. Sam.
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.
Are those messages from courierd/courierlocal, or from the smtpd? If it's the former, then you probably had messages in the tmp folder that hadn't completed queueing. If you're seeing a lot of smtpd messages, then it's possible that tcpd thinks that it's hit maxperc or maxperip and is not accepting new connections. This happened with one of the systems I run on an older version of courier. That version did not log dropped connections, so it was difficult to diagnose. The current version does log dropped connections, which was among the reasons we upgraded.
I believe it is a combination of both--some held emails were just local mail (cron messages and such) and some were regular smtpd mail.
Some were hours old and some were fairly new, though I don't know if that matters for the tmp/queueing issue you mention.
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.
The upgrade isn't that big.
Good to know--though I don't even have a test box (RHEL 2.1) to try the upgrade on, so I'm Very Very Nervous, though I expect it would go just fine.
Not actually having a "mirrored" development environment to test on is not good, I know.
Thanks very much for your help, and I agree that I really should do the upgrade--we'll see.
Cheers, Dan
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