Hi,
Once in a while I run into this problem, in that it takes a significant amount of time to get the greeting when connecting to port 25.
What variables play into that? I use spamcop for RBL, could it be that spamcop is slow in responding and that affects courier's response time?
Broken reverse DNS for the connecting IP address, and/or broken firewall that drops identd queries.
by RBL alone in a matter of a few days). So the traffic is quite high. If that is the problem, how can I remedy it? How can I tell for sure whether that is indeed the problem?
See http://www.courier-mta.org/FAQ.html#esmtptimeout
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