Re: [exim] verify = helo, PTR record lookup

On Tue, 12 Jun 2007 11:13:07 -0400, Marc Sherman
<msherman@???> wrote:

>FYI, the requirement that the PTR and A records must match is in RFC
>1912, section 2.1, paragraph 2.

RFC1912 is informational only, there is no "requirement."

That said, a lot of spam comes from hosts without proper reverse /
forward DNS. I would guess that nowadays 98%+ of legit mail servers
pass the DNS test. So if you reject on that basis, you won't lose
much.


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