Re: [Exim] Hotmail forgeries or genuine hosts/ip?

M Maas wrote:
>
> Either way, blocking someone from sending email to you just
> because he does not have a reverse DNS is debatable to say the
> least.
>
> According to the RFC's it is not neccisary to have it. And
> many cable/dls users could never even get a rdns from there
> ISP's right?

Yep - they're mostly the ones we want to block. Mail directly to my MXs from
a dynamic IP is automatically unwanted.

My take on this is that not have FCrDNS is not prima facae evidence to block
(others would disagree), but there is sufficient correlation between hosts
that have faulty rDNS and hosts I don't want to receive mail from for it to
be a useful enough tool.

I bet the Hotmail admins have seen a spike in the number of rejects at SMTP
time today :-)

Peter