Re: [exim] Bogus HELOs

On Friday, May 20, 2005 11:41 AM, Chris Lear <chris.lear@???>
wrote:

> * Mark Smith wrote (05/20/05 10:58):
>> Are there any *valid* reasons for a mailserver's HELO greeting not
>> matching the hostname obtained from rDNS?
>
> I think so. In a virtual server environment. Say one server has 10 DNS
> records resolving to 1 IP address. Only one name will be returned by
> rDNS,

Not necessarily. There's no reason why there can't be 10 PTR RRs for that
IP. A number of broken pieces of software assume there will only ever be
one, but it's perfectly legal.

Regards,

Adam