[Mailman-Users] Problems with undeliverable mail

Richard Idalski ridalski at nandomedia.com
Mon Dec 31 20:40:10 CET 2001

This works, and works well, but If I'm correct also creates an open-relay,
for security reasons this is usually unacceptable. This was the primary
reason I switched to postfix, same functionality minus the security gap.

    -Richard Idalski

-----Original Message-----
From: mailman-users-admin at python.org
[mailto:mailman-users-admin at python.org]On Behalf Of Graham Dunn
Sent: Monday, December 31, 2001 1:41 PM
To: Michelle Brownsworth
Cc: mailman-users at python.org
Subject: Re: [Mailman-Users] Problems with undeliverable mail

On Sun, Dec 30, 2001 at 11:48:21PM -0800, Michelle Brownsworth wrote:
> To: mailman-users at python.org
> From: Michelle Brownsworth <michelle at primelogic.com>
> Subject: Re: [Mailman-Users] Problems with undeliverable mail
> Cc: J C Lawrence <claw at kanga.nu>
> Date: Sun, 30 Dec 2001 23:48:21 -0800
> Okay, okay...  I know when to throw in the towel.  :^)  I'll
> investigate Postfix, with the hope that it's better than Qmail.
> After running it on a server for a couple of years, I don't care for
> Qmail at all.

In your .mc file,

define(`confDELIVERY_MODE', `deferred')

This will stop sendmail from doing DNS queries upon accepting the mail.
It's intended for situations where you want to prevent DNS lookups (dialup,

I hope that does what you want.


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