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Relaying denied / can't send mail to aol.com

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Relaying denied / can't send mail to aol.com - 7.Apr.2006 5:53:58 AM

jackis

Posts: 1
Joined: 7.Apr.2006
Status: offline

We have 1 internal Exchange 2000 server for our only domain, dortfcu.org. When we try to send an email to anyone at the aol.com or cisco.com domain, their email server says 550 5.7.1 <email address>... Relaying denied. I think the issue is a dns issue and is due to the fact that I upgraded one of our 2 dns servers from windows 2000 server to windows 2003 server last weekend.

NSLOOKUP of dortfcu.org with type=mx says that mail exchanger = smtp.dortfcu.org. The servers real name is dort2.dortfcu.org. So I guess this means my mx record is wrong? I don't have access to my dns server right now but I do remember looking at an mx record on there today before I left work. AT&T, our ISP, actually hosts our dns records, including an mx record. So why does my internal dns server also have an mx record - is this correct?

I pulled a dns report for our domain dortfcu.org, and it says:
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 dash, then the host name). If your mailserver send 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.
smtp.dortfcu.org claims to be non-existent host
dort2.dortfcu.org.org:
220 dort2.dortfcu.org ****** Thu, 6 Apr 2006 17:20:03 -0400
As I stated earlier - my server actually IS dort2.dortfcu.org so I'm not sure why this is being reported this way. I think it probably also has to do with why my mail is being rejected. Hoping there is a dns/exchange guru out there that can advise!

Thanks
--
Jacki

< Message edited by jackis -- 7.Apr.2006 6:20:08 AM >

Post #: 1

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RE: Relaying denied / can't send mail to aol.com - 7.Apr.2006 10:25:25 PM

mfarouk

Posts: 100
Joined: 14.Feb.2005
From: Toronto
Status: offline

Were you able to send emails to aol and cisco before upgrading your DNS?

(in reply to jackis)

Post #: 2

RE: Relaying denied / can't send mail to aol.com - 18.Apr.2006 9:52:12 PM

Viper62

Posts: 64
Joined: 11.Feb.2005
From: Central FL
Status: offline

I just went through a similar issue with AOL and my company - I had one of my server IP's listed with them on their whitelist but they did not have my local networks IP and so I found they had it blocked. It took me some time to find this but I have a direct number to their postmaster and I would try that first - the number is 703-265-4670.

(in reply to jackis)

Post #: 3

RE: Relaying denied / can't send mail to aol.com - 20.Apr.2006 1:21:11 PM

bipolarchucker

Posts: 49
Joined: 20.Jan.2006
From: Leeds, UK
Status: offline

Hi

Don't aol.com do reverse DNS to A (HOST) checking? ie. They see if your reverse DNS corresponds to your forward DNS A records. ie. if your ISP hasn't set your rDNS for you (they have to register it) then aol won't accept the connection. This may be the same for cisco but don't quote me on that!

Regards

Lewis

< Message edited by bipolarchucker -- 20.Apr.2006 1:22:50 PM >

(in reply to Viper62)

Post #: 4

RE: Relaying denied / can't send mail to aol.com - 20.Apr.2006 4:00:37 PM