Yuan P Li writes:
No, that does not seem to be the problem. The dns reverse lookup
generally takes 1-2 seconds. But when I try to connect to esmtp,
the client sits at "connecting to server" for at least 1 minute.
I had dupfilter on. But now disabled it and stopped courierfilter as
well. But it is still slow.
It's probably the identd lookup stalling. ESMTP connections have the server
issue an identd query on the sender.
Go and ask Microsoft to fix their TCP/IP stack.