On Mon, 13 Nov 2006, Jon Grant wrote:
I'd also like to Reject 554 connections to my MX server from IP
addresses which do not have reverse DNS set up on them, and connections
which say HELO with a different domain name to their Reverse DNS.
Amen to strict HELO.
However, please do not reject *solely* based on lack of reverse DNS. Broadband
ISPs are a monopoly in many areas, and small domains owners (less that class C)
have no way to force the ISP to publish or delegate a proper PTR. Domain
owners can always use a proper HELO name, and this is clear and sufficient
proof that the MTA is managed by the domain owner.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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