Hi Stuart, Thanks for your reply
Stuart D. Gathman elucidated on 13/11/06 17:03:
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.
can't a spammer just put mail.gmail.com in the HELO field though then?
Maybe I didn't understand your message. I do see the problem for people
who cant setup reverse DNS. I do think the IP should have something
though, even if it is dsl-1-2-3-5.host.com
Kind regards
Jon
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