[Robotgroup] OT: Mail server "greylisting" technique

[Unfocused Brain]

If spammers do decide to get around this then you can expect to see spam
now being sent to all the mx's that are listed without regard as to
which is primary. Could double or triple spam.

James

Clendon Gibson wrote:
> It sounds like a perfectly safe way to decrease spam. All your really doing is forcing a fail-safe built in to the standard to apply every time. 
> 
> The only problem I see is that if you are using the MX records to really record a fail safe connection then this method would eliminate that failsafe. 
> 
> This is security through obscurity. As long as the spammers don't loose too many targets over this method it will continue to be effective. If they start to feel the pinch then some clever person will add 3 lines of code to the spam engines and the advantage will be gone.
> 
> ----- Original Message ----
> From: Vern Graner <vern at txis.com>
> To: The Robot Group Mailing List <robotgroup at puremagic.com>
> Sent: Tuesday, January 23, 2007 12:35:15 PM
> Subject: [Robotgroup] OT: Mail server "greylisting" technique
> 
> And now for something COMPLETELY different.. :)
> 
> For those of you with Linux chops and/or mail server/handler experience,
> I'd like opinions on this:
> 
> http://www.joreybump.com/code/howto/nolisting.html
> 
> TIA :)
> 
> Vern
>