1 minute pause on sendmail login

Paul Howarth paul at city-fan.org
Thu Dec 22 11:36:24 UTC 2005

Andy Pieters wrote:
> Hi
>>Sendmail will do a reverse DNS lookup for the IP address of the
>>connection to put the name in the logs.  Apparently this
>>doesn't work for the address you are testing from and you
>>wait for a timeout.  Perhaps the delegated DNS server is
>>blocked by a firewall that drops the packets.  Likewise there
>>is an IDENT query for the owner of the socket, but those
>>timeouts are usually faster.
> It seems to happen with *everyone* who tries to connect outside of the LAN.

Not from here it doesn't:

$ date; telnet mail.vlaamse-kern.com 25; date
Thu Dec 22 11:34:47 GMT 2005
Connected to mail.vlaamse-kern.com.
Escape character is '^]'.
220 giga.vlaamse-kern.com ESMTP Sendmail 8.13.1/8.13.1; Thu, 22 Dec 2005 
12:34:47 +0100
221 2.0.0 giga.vlaamse-kern.com closing connection
Connection closed by foreign host.
Thu Dec 22 11:34:49 GMT 2005

I have working reverse DNS though.


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