Re: reverse dns

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As already mentioned, you need to ensure you have rDNS set up. But the specifics don't need to match. But the reason for my reply, beyond reiterating what others have posted, is to answer (or critique) your data.

What you posted is the forward lookup zone, not the reverse lookup zone. Therefore what you posted doesn't address your concern regarding your debate with your ISP either way.

Reverse DNS works by defining a specific type of record called a PTR record (just like the zone you posted has A, MX, and TXT records) and must belong in the appropriate reverse zone, usually controlled by your ISP. That zone will usually have a partial IP address, depending on how it is delegated, which lets rDNS lookups find the appropriate record. The whole concept of rDNS, I've recently learned by reading this newsgroup, is more misunderstood than forward lookups. But a little planning can keep you out of a heap of trouble.

-Cliff

"SteveM" wrote in message news:xn0fr2eop1aila000@xxxxxxxxxxxxxxxxxxxxx
Your rDNS record needs to be setup by your ISP, and have it resolve IP
address 69.88.125.4 to mail.protocolpm.com. The important thing is that
you have an rDNS record for 69.88.125.4, but it doesn't actually need
to resolve to mail.protocolpm.com as such - those mail exchangers which
insist on senders having an rDNS usually only check for the record's
presence, not it's actual value. If they did verify the correct
resolution it would kill off all other ISPs' mail servers which host
multiple customer domains.

Dane wrote:

From: =?Utf-8?B?RGFuZQ==?= <Dane@xxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: reverse dns
Date: Wed, 4 Jun 2008 23:32:00 -0700

new 2003 install
email to AOL and Comcast failing - send and receive to others works
fine

mxtoolbox says all is fine with domain/server/dns except reverse dns
fails

domain host and I disagree about how the dns should be set up

here is the current setup - please critique - thanks

$TTL 86400

@ IN SOA ns29.webmasters.com. admin.webmasters.com. (
952591099 ; serial
10800 ; refresh
3600 ; retry
604800 ; expire
86400 ) ; minimum

protocolpm.com. IN NS ns29.webmasters.com.
protocolpm.com. IN NS ns27.webmasters.com.
ns29.webmasters.com. IN A 208.64.137.161
ns27.webmasters.com. IN A 208.64.137.141
protocolpm.com. IN A 208.64.137.161
www.protocolpm.com. IN A 208.64.137.161
mail.protocolpm.com. IN A 69.88.125.4
protocolpm.com. IN MX 10 mail.protocolpm.com.
protocolpm.com. IN TXT "v=spf1 ip4:69.88.125.4 ~all"



--
Steve.
MCP - Small Business.

.

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