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."
There have been a considerable number of bugs fixed. I would definitely recommend updating your courier installation. Be sure to build and test on a separate machine, but the update should be very smooth. I performed such an update recently, and didn't have problems with it.
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...
mailq shows very little--the queue is almost empty and is normal.
mailq won't show you what's in the tmp folder, IIRC. If something is broken, it's possible for mail to get queued up, but not show in mailq.
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.
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.
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