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-----Original Message-----
From: Marc Perkel [mailto:marc@perkel.com]
Sent: Tuesday, November 28, 2006 00:25 AM
To: Uncle George
Cc: dl@blackpacket.net;qmail@list.cr.yp.to
Subject: Re: Advanced tricks I use to get rid of spam using MX 4xx
Uncle George wrote:
>
> Yes, maybe MX15 will accept the message! Maybe MX20 will accept the
> message. You wont know till you try.
>
> As the original poster stated, a long time ago, his service
> greylist's everyone on the lowest MX. But apparently accepts, without
> greylisting, on the next MX. This on the presumption that spammers
> will only try the lowest MX, and ignore the higher MX's. Real MTA's,
> as per 2001 spec's, would have tried at least the 2 very lowest MX's,
> if not the preconfigured limit, or all of the MX's .
>
> Its not for me to say what the reasons ( or reasonableness ) are for
> why this SMTP strategy is acceptable for some. Or even why such
> matters have to be codified in an RFC .
>
Except for the qmail problem, if someone wanted to get dir of say 90% of
all their spam here's an easy way to do it.
You have 3 MX records. The highest and lowest both return 4xx on
everything. The middle MX accepts all. Then you block with a few of the
better black lists and you have a spam filter that is more accurate than
using Spam Assassin by itself.
I use both. When I get down to the last 10% I can cull out half the good
email with my whitelist tricks and that leaves only 5% for SA.
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