RE: [Exim] Viruses, and HELOs without dots

Nigel Metheringham said:
> On Mon, 2004-08-02 at 18:40, Kjetil Torgrim Homme wrote:
>> he's actually just enforcing the requirements of the RFCs, except he has
>> an exception to allow for some common misconfigurations. I don't see
>> how you can say that RFC 2821 has had less thought and design going into
>> it than SPF.
>
> For example, look at pretty much *any* of the big ISPs. They have
> multiple clusters of mail machines. One group of machines handles
> incoming mail - they have the MXes pointing at them. A different
> cluster of machines handles outgoing mail, they are not part of the
> MXes, and may often have a completely different machine name than the
> domains they handle.

Doesn't even work for smaller setups - the server I relay my private email
through (using MSA) doesn't listen on port 25. (Actually it does, but
firewall rules only allow traffic from the border MXs through to it).

Peter