[RFCI-Discuss] DSN listing of secureserver.net

[Alan Brown]

On Sun, 29 Oct 2006, Alex van den Bogaerdt wrote:

> > Thankfully there are almost no such hosts left on the public Internet
> > and the lessons learnt from HELO and rDNS forgeries in the past have
> > resulted in the better header stamping we now have.
>
> And I do agree this is necessary.
>
> My point: from the examples in rfc821 it is clear that the parameter
> to helo is a hostname (called a domain in rfc821), not just a random
> string that may or may not mean something.

The original intention was for "DOMAIN" to be the mailing domain in
question, not the hostname (more accurately, the domain where the
postmaster could be located in case of problems), but as I said
previously, the prime function of HELO is to prevent hosts looping
deliveries to themselves.

On that basis, hotmail were correct in their HELOs.

AB