Thanks or the reply. That sucks. Is there a way around this, short of
turning that off or whitelisting?
On Oct 27, 2009, at 11:34 AM, Wietse Venema wrote:
Dennis Putnam:
I have my Postfix configured to require proper DNS resolution in both
directions. However, I have a situation that is giving me problems
perhaps due to multiple PTR records for the IP address. I am getting
the error:
450 Client host rejected: cannot find your hostname
When I 'dig' the hostname the IP address matches that of the server
making contact with my Postfix. When I 'dig -x' that same IP address,
among the many PTR records, the hostname used in the 'HELO' matches.
The from doesn't match but that is not what it is comparing, right?
Can someone tell me what might get going on here? I am running
version
2.1.5 so perhaps that is part of the problem.
Postfix takes the first hostname that is returned by the getnameinfo()
system library function. If that first name does not resolve to
the client IP address, then Postfix will not try the the second
etc, name.
Wietse
Dennis Putnam
Sr. IT Systems Administrator
AIM Systems, Inc.
11675 Rainwater Dr., Suite 200
Alpharetta, GA 30009
Phone: 678-240-4112
Main Phone: 678-297-0700
FAX: 678-297-2666 or 770-576-1000
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