1 minute pause on sendmail login

[sport]

I see this on my laptop during boot, but I don't establish a connection
until after x is up.  I would like to know where the time out is set as
well.  

-cm

On Wed, 2005-12-21 at 17:10 -0600, Les Mikesell wrote:
> On Wed, 2005-12-21 at 16:57, Andy Pieters wrote:
> > Hi list
> > 
> > I am seeing extreemly long login times on my smtp server.  It pauses for ~1min 
> > right after connection.
> > 
> > telnet mail.vlaamse-kern.com 25
> > Connected to mail.vlaamse-kern.com 
> > Escape character is '^]'.
> > ****PAUSES FOR 1 MINUTE***
> > 220 mail.vlaamse-kern.com ESMTP Sendmail 8.13.1/8.13.1; Wed, 21 Dec 
> > 2005 18:38:21 +0100
> > 
> > Further information: when I connect from the lan to port 25 on the public ip 
> > address, the connection is refused, but when I connect from the lan to port 
> > 25 on the server's private ip address, the connection is established and the 
> > pause does not occur.
> > 
> > Can anyone make sense of this?
> 
> 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.
> 
> -- 
>   Les Mikesell
>    lesmikesell at gmail.com
> 
>