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

Renaud Allard wrote:
>
> That means if a mail server has a PTR of
> 123.123.123.123.dynamic.example.net, that
> 123.123.123.123.dynamic.example.net resolves to its IP, and server
> HELOes with www.google.com. The remote mail server MUST NOT reject the
> message based on this info.
>
> Can someone cancel this by citing another RFC?

No, that's all correct. So the end result is that you MUST not do this:

deny !verify = helo

You're welcome to spam score based on it, or quarantine, or anything
else, though.

- Marc