Re: SMPTD not responding on connect, from SOME servers.

[Markus Stumpf <maex-lists-qmail@leo.org>]

On Fri, Dec 22, 2006 at 02:34:10PM +0100, Ander Tobias wrote:
> It seems that it takes an awful lot of time until the smtp banner is
> provided (on systems that got problems to connect). And that is probably
> the fault, normal smtpds that connects to our server times out before
> they got the banner.

I'd bet the DNS server you are using has problems reverse resolving the
IP address of the connecting hosts.
Read  http://cr.yp.to/ucspi-tcp/tcpserver.html

I'd recommend setting the -R -H -P and -l <localhostname> flags.

        \Maex