OT: secondary MX

[Steve Evans]

And when the primary MX is down, everybody can /dev/null themselves.
Even when the primary MX is up there's no guarantee the secondary won't
be used by legitimate servers out there. 


Steve Evans
SDSU Foundation


-----Original Message-----
From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
Behalf Of Jeff Earickson
Sent: Thursday, March 18, 2004 4:20 PM
To: MAILSCANNER at JISCMAIL.AC.UK
Subject: Re: OT: secondary MX

Question...  My site has one MX record, always has.  If I define a
higher value MX for the spammers (pointing to nothing running mail), how
badly would I shoot myself in the foot?  Let the spammers /dev/null
themselves and real email go to the primary MX?

Jeff Earickson
Colby College

On Thu, 18 Mar 2004, Mike Zanker wrote:

> Date: Thu, 18 Mar 2004 21:55:26 +0000
> From: Mike Zanker <mike-sender-1ed4e7 at zanker.org>
> Reply-To: Mike Zanker <mike-dated-1080078927.27e96a at zanker.org>
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: OT: secondary MX
>
> On 18 March 2004 13:58 -0700 Dustin Baer <dustin_baer at IHS.COM> wrote:
>
> > I just added a secondary MX for our domains.  I am absolutely amazed

> > at how fast the spammers realized it was open for traffic.
>
> Nothing amazing about it. Their software looks up the MX records for a

> domain and often uses the lowest priority one. So as soon as your 
> secondary MX goes in the DNS, the spamming software will start using
it.
>
> Mike.
>