On Sun, Mar 05, 2000 at 10:17:22PM -0500, andy huhn wrote:
> What is the difference between ident-lookups and DNS? And why would
> either one affect incoming mail?
Ident lookups try to gather information about the userid at the other
end of an TCP connection using the (unreliable information of) ident protocol.
If the ident port is e.g. filtered by a firewall and this firewall is
set up incorrectly (as most are) and just drops the packets without
sending proper ICMP response messages you'll have to wait till the
connection times out (usually 60 seconds with tcpserver).
Thus SMTP connection to your SMTP-server will be delayed.
The same effect happens if you do reverse DNS lookups and your DNS
server doesn not respond quickly.
\Maex
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