Re: PTR RDNS Question/Error
- From: "Gregg Hill" <greggmhill at please do not spam me at yahoo dot com>
- Date: Sun, 21 Jun 2009 14:58:17 -0700
Your MX record and mail server IP do not match your PTR record. Your PTR is
for crockettmyers.com and not your actual mail server of
cmaserver.crockettmyers.com.
From dnsstuff.com:
OK. The IPs of all of your mail server(s) have reverse DNS (PTR) entries.
RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It
is strongly urged that you have them, as many mailservers will not accept
mail from mailservers with no reverse DNS entry. Note that this information
is cached, so if you changed it recently, it will not be reflected here (see
the 'Reverse DNS Tool' for the current data). The reverse DNS entries are:
154.9.35.24.in-addr.arpa crockettmyers.com. [TTL=27853]
Your MX record is for "cmaserver.crockettmyers.com" but your PTR is for
"crockettmyers.com" and the IPs for those two domain names are different.
Have your ISP set up a PTR for "cmaserver.crockettmyers.com" pointing to
24.35.9.154.
Also, fix your mail server greeting to reflect the FQDN of
cmaserver.crockettmyers.com. See below.
WARNING: One or more of your mailservers is claiming to be a host other than
what it really is (the SMTP greeting should be a 3-digit code, followed by a
space or a dash, then the host name). If your mailserver sends out E-mail
using this domain in its EHLO or HELO, your E-mail might get blocked by
anti-spam software. This is also a technical violation of RFC821 4.3 (and
RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should
have an A record pointing back to the same server. Note that this one test
may use a cached DNS record.
cmaserver.crockettmyers.com claims to be host crockettmyers.com [but that
host is at 72.167.232.59 (may be cached), not 24.35.9.154]. <br />
Gregg Hill
"Richard K" <rkokoski@xxxxxxxxxxxxxxx> wrote in message
news:OXb36Up8JHA.1336@xxxxxxxxxxxxxxxxxxxxxxx
I am trying to set up a reverse dns pointer record for a domain and I think
I have it done right but obviously it's not. Here is what I have from an
NSLookup and the RDNS failure in the message header. What am I doing wrong
here?
Thanks!
-Richard K
domain: crockettmyers.com
Static IP: 24.35.9.154 (external IP address of the SBS 2003 R2 Prem
server)
------------------------------------------------------------------------------------------------
From the receiving end I look at the .txt record and get...
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\rkokoski>NSLOOKUP
*** Can't find server name for address 10.0.1.10: Non-existent domain
*** Default servers are not available
Default Server: UnKnown
Address: 10.0.1.10
set type=txtServer: UnKnown
crockettmyers.com
Address: 10.0.1.10
Non-authoritative answer:
crockettmyers.com text =
"v=spf1 mx ip4:24.35.9.154 ~all"
------------------------------------------------------------------------------------------------------
But from the message header when the message arrives I get...
Microsoft Mail Internet Headers Version 2.0
Received: from crockettmyers.com ([24.35.9.154] RDNS failed) by
foxdtechllc.com with Microsoft SMTPSVC(6.0.3790.3959);
Sun, 21 Jun 2009 13:17:00 -0400
Content-class: urn:content-classes:message
MIME-Version: 1.0
.
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