Author: Edgar Lovecraft Date: To: exim-users CC: Wakko Warner Subject: Re: [Exim] RFC: Fighting Spam due to forgeries of outblaze domains
Wakko Warner wrote:
..[snip]... > > Exim 2.4x (and 2.3x i believe) will set the $sender_host_name upon
> > lookup of PTR records to what the DNS resolver PTR returns for
> > $sender_host_address. This is not the same as asking exim if helo/ehlo
> > is verified.
> > --EAL--
>
> I said nothing about helo/ehlo. Isn't exim 2.x a bit old?
> The numbering was my fault missed a 4 the first time and carried it through
the second time... should have been 4.24 and 4.3x, OOPS! >
> I know sometime in 4.x that asking for $sender_hostname caused it to do
> rDNS, but I believe it also does a dns lookup for the name that is
> retrieved from rDNS before setting this.
> --
That was my point with the helo/ehlo = verified, I know that you did not
did not mention anything about helo/ehlo, but when exim does a PTR lookup
it just returns what is found to $sender_host_name. But to verify a host,
such as helo/ehlo verification, then it does a check for a DNS record on
the value returned by the PTR record lookup.
--EAL--
