The issue occasionally goes away for up to months at a time.
We're currently at courier 0.44.2 and redhat 7.3.
The issue is fairly simple:
Without any obvious changes in the logs, the mail server simply stops accepting mail.
Issuing a "service courier restart" fixes the problem until it arises again.
When the server is working properly, a telnet to port 25 is successful.
When the server has broken, a telnet to port 25 fails with connection denied.
When the server is working properly, "lsof -i TCP:25" shows this sort of item, along with others like it:
couriertc 5732 root 5u IPv4 30883124 TCP *:smtp (LISTEN)
When the server has broken, "lsof -i TCP:25" shows nothing.
It would seem that the couriertcpd service is possibly restarting itself, but somehow fails to startup on some instances. I'd be glad to post other information about my setup if anybody has ideas about what may be going on.
Skyler
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