MX records

Marc Herbert <[email protected]> Tue, 17 Aug 2004 08:23:02 +0200 (CEST)
Newsgroups gmane.mail.spam.active-spam-killer.general
Message-ID <Pine.LNX.4.58.0408170820200.13468@fcat>
On Tue, 17 Aug 2004, Sam Vilain wrote:

> 1. if the MTA that sent the mail is the same as any of the IP addresses
> that the MX record for the mail being set to resolves, then
> auto-whitelist the address, unless it was on the blacklist.  This
> feature would have a lifetime; it is possible that eventually the
> obvious (non-trivial) holes that exist in this idea would be exploited
> by spammers.  However, this would mean that in the meantime, people who
> are SMTP-AUTH'ing like everyone should be :-) would not be sent annoying
> e-mails by ASK.

MX records give the IP addresses of _receiving_ mail servers, probably
not the same as sending mail servers.
Check: http://spf.pobox.com/

Granted, your suggestion would cause no harm in any case. But I am
afraid it would be seldom useful and does not worth the effort.



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