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From "J.D. Falk" <jdfalk-li...@cybernothing.org>
Subject Re: spam bots guessing mx???
Date Mon, 09 Mar 2009 19:20:25 GMT
Bazooka Joe wrote:

> Last week I got a client that wanted me to spam virii filter for their
> in house exchange server.
>
> I changed the mx from mail.domain.tld (their exchange) to
> mail2.domain.tld (my sa box) which relayed to mail.domain.tld.
>
> Last week all worked as expected.  The hundreds of spam droped to 0;
> until this weekend.  Looking at the headers, mail is going directly to
> the mail.domain.tld even though it isn't listed as mx anywhere.
>
> I can tell the exchange server to only except mail from my server but
> has anyone else experienced this?

Yeah, I've heard other stories of spam bots caching old MX records for 
months after they've been changed in the DNS.

-- 
J.D. Falk
Return Path Inc
http://www.returnpath.net/

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