"Nolisting"

[Jeff A. Earickson]

I do it the other way around.  Our high MX always responds with
"400 try again later" via smtptrapd.

Jeff Earickson
Colby College

On Tue, 27 May 2008, Stanier, Alan M wrote:

> Date: Tue, 27 May 2008 13:37:16 +0100
> From: "Stanier, Alan M" <alan at essex.ac.uk>
> Reply-To: MailScanner discussion <mailscanner at lists.mailscanner.info>
> To: MailScanner discussion <mailscanner at lists.mailscanner.info>
> Subject: RE: "Nolisting"
> 
> The last time I checked, it was blocking 84% of our spam.
>
> -----Original Message-----
> From: mailscanner-bounces at lists.mailscanner.info
> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Paul
> Welsh
> Sent: 27 May 2008 13:26
> To: mailscanner at lists.mailscanner.info
> Subject: OT: "Nolisting"
>
> Hi all
>
> I have read that one way of blocking spam is to use a lowest priority MX
> record that points to a host that doesn't respond to SMTP requests.
> I've seen this idea coined as "nolisting".
>
> The idea is to block the many spammers who target the lowest priority
> MX, eg, the one with priority 90 rather than 10 as a way of trying to
> circumvent anti-spam measures.  If the MX with the lowest priority
> doesn't respond then the spammer doesn't try the higher priority MX but
> just moves on to the next victim.
>
> Any thoughts on this idea?
>
> Personally, I can see how it would block a percentage of spam but
> whether that percentage is high enough to make it a worthwhile idea is
> open to question.
>
> Regards
>
> Paul
>
>
> ________________________________________________
> Message sent using UebiMiau 2.7.9
>
>
> --
> MailScanner mailing list
> mailscanner at lists.mailscanner.info
> http://lists.mailscanner.info/mailman/listinfo/mailscanner
>
> Before posting, read http://wiki.mailscanner.info/posting
>
> Support MailScanner development - buy the book off the website!
> --
> MailScanner mailing list
> mailscanner at lists.mailscanner.info
> http://lists.mailscanner.info/mailman/listinfo/mailscanner
>
> Before posting, read http://wiki.mailscanner.info/posting
>
> Support MailScanner development - buy the book off the website!
>