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List:       linux-net
Subject:    Re: New mail server thread
From:       miquels () cistron ! nl (Miquel van Smoorenburg)
Date:       1998-05-29 20:41:46
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In article <199805291816.MAA02756@smtp.trilobyte.net>,
Support <neil@www.trilobyte.net> wrote:
>I run a small ISP and am happily using a non-microsoft environment to do it.
> However there is another provider here who is completely NT based.  
>Enough background.  I have several customers who are connected to both
>systems and complain that sending mail through my system is much slower than
>through the other.  What happens is that they compose the message and then
>hit send, at which point it waits for between 5 and 10 seconds and then
>flies out.   On the other provider's system as soon as they hit send the
>connection is made.  

It can be 2 things:

1. Sendmail does a DNS lookup on the address of the incoming connection.
   See if your nameserver is properly setup, sep. wrt reverse resolving.

2. Sendmail also by default does an "ident" query back to the SMTP
   connectee (TCP port 113). Some stacks do not return "connection refused"
   but are just quiet. In this case you should just turn that off.
   (O Timeout.ident=0s in sendmail.cf)

Ofcourse this is assuming you use sendmail, but other mailers probably
do the same.

Mike.
-- 
 Miquel van Smoorenburg | Our vision is to speed up time,
    miquels@cistron.nl  |   eventually eliminating it.
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