About a week ago, we migrated a big chunk of network from an outdated
configuration where the mail system was protected by a 3620 with NAT and no
port-blocking to a PiX 520 running 5.3. The IP address remained the same,
of course, both internally and externally, and we (duh) opened port 25 for
mail.
Upon reviewing our mail logs for the last week, we found an interesting
thing: Mail transmission errors (the ones that get flagged with 'timeout
waiting for input from <X>') increased in frequency DRAMATICALLY. As in,
this last week we had 1250 of these errors; on average, for the three weeks
before that, we had 2.3/week of these errors. Mail quantity has not
drastically increased (41% up from average), but that doesn't explain a
53,648% increase in errors.
Does this strike bell? Does anyone have any suggestions for me to try to
debug this?
Thanks,
-roy
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