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The POP3 (mail) server is not responding
The POP3 (mail) server appears to be down. Within the Sun Cobalt server Control Panel, try turning mail service off and then on again to see if this corrects the problem. If not, try rebooting the server itself. If this still does not correct the problem, contact Sun Cobalt Technical Support.
Looking in /var/log/messages I saw a fair few entries that said:
The conventional way to teat this is to increase the /etc/inetd.conf
to something like
But I felt this was a symptom of another problem. I looked in /var/logs/auth and saw a few entries like
Then I greped the same IP in the main /var/logs/maillog file and saw hundreds of entries, so I headed off to /etc/hosts.deny added a line.
Then restarted the mail server in the GUI as suggested in the warning email and all now seems well.