Exchange not sending/receiving emails from AOL.com

Posted on 2010-11-16
Medium Priority
Last Modified: 2012-05-10
I have an exchange 2003 (no spam filtering) running on windows 2003 SBS.

It can't send/receive emails from AOL.com.  How can I troubleshoot it?  I get the below "delayed" message but it eventually gives up and get an NDR.


-------- Original Message --------
Subject:       Warning: message 1OxjpD-0002bQ-Be delayed 48 hours
Date:       Wed, 22 Sep 2010 13:18:31 -0400
From:       Mail Delivery System <Mailer-Daemon@dime77.dizinc.com>
To:       xxx

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its recipients after more than 48 hours on the queue on dime77.dizinc.com.

The message identifier is:     1OxjpD-0002bQ-Be
The date of the message is:    Mon, 20 Sep 2010 10:06:41 -0700
The subject of the message is: Re: Tuesday's Meeting

The address to which the message has not yet been delivered is:


No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you.
Question by:fstinc
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LVL 20

Expert Comment

ID: 34152850
assuming this dime77.dizinc.com is your server ? can you confirm that the server can reach AOL's email servers on port 25 (do a telnet).

15      mailin-01.mx.aol.com      60 min      SMTP Test      Blacklist Check
15      mailin-02.mx.aol.com      60 min      SMTP Test      Blacklist Check
15      mailin-03.mx.aol.com      60 min      SMTP Test      Blacklist Check
15      mailin-04.mx.aol.com      60 min      SMTP Test      Blacklist Check

any of the above... try using the name first, let us know if that is reachable on port 25, and check the IP too.
LVL 15

Expert Comment

ID: 34152859
I assume you have a static IP assigned to your exchange server?
LVL 76

Expert Comment

by:Alan Hardisty
ID: 34152994
AOL usually reject you if you are badly configured or blacklisted.

In your case, you are badly configured.

Your MX record is:

Your 1 MX record is:

0 dizinc.com. [TTL=14400] IP= [TTL=14400] [US]

and your mail server is responding as:

OK: All of your mailservers have their host name in the greeting:

220-xeon.dizinc.com ESMTP Exim 4.69 #1 Wed, 17 Nov 2010 02:53:10 -0500 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. <br />

Your Reverse DNS record is:

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: xeon.dizinc.com. [TTL=86400]

That in itself is good, but what is not good is that xeon.dzinc.com resolves as follows:

nslookup xeon.dzinc.com

Non-authoritative answer:
DNS request timed out.
    timeout was 2 seconds.
Name:    xeon.dzinc.com

For you to be configured properly, xeon-dzinc.com needs to resolve back to IP Address  Change that and AOL.com should accept your emails (you may have to contact them to get removed from their blacklist).
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Author Comment

ID: 34153274
I ran the telenet command mailin-01.mx.aol.com from the email server and it returned this:
command used: Telnet > open > mailin-01.mx.aol.com 25

220-mtain-me04.r1000.mx.aol.com ESMTP Internet Inbound
220-AOL and its affiliated companies do not
220-authorize the use of its proprietary computers and computer
220-networks to accept, transmit, or distribute unsolicited bulk
220-e-mail sent from the internet.
220-Effective immediately:
220-AOL may no longer accept connections from IP addresses
220 which no do not have reverse-DNS (PTR records) assigned.
421 4.4.2 mtain-me04.r1000.mx.aol.com Error: timeout exceeded

Connection to host lost.
LVL 76

Accepted Solution

Alan Hardisty earned 2000 total points
ID: 34153486
Please change the IP Address associated with xeon.dzinc.com to IP in your External Domains DNS records.   That is ALL you should need to do.
LVL 20

Expert Comment

ID: 34153547
220-AOL may no longer accept connections from IP addresses
220 which no do not have reverse-DNS (PTR records) assigned.
421 4.4.2 mtain-me04.r1000.mx.aol.com Error: timeout exceeded

thats the problem then, you need to ensure that your MX record name and IP are in sync.
your mx record is      dizinc.com

you should probably for management sake have it as xeon.dizinc.com (instead of just dizinc.com )pointing at and then ensure the reverse DNS record for is xeon.dizinc.com as long as they match you are good.

your IP isnt on any blacklists so your all good once the above is changed.
LVL 76

Expert Comment

by:Alan Hardisty
ID: 34153625
@Woolnoir - have you read my earlier post http:#a34152994 ?

Reverse DNS is configured correctly.  The issue is that xeon.dzinc.com resolves to a different IP Address to the fixed IP Address that is being used.
LVL 20

Expert Comment

ID: 34153654
> @Woolnoir - have you read my earlier post http:#a34152994 ?

My apologies i didnt, I read from the posters last post downwards i.e http:#a34153274
LVL 20

Expert Comment

ID: 34153659
Either way , the fault has been identified and should be pretty easy to correct.
LVL 76

Expert Comment

by:Alan Hardisty
ID: 34153670
No probs - it can be useful to re-scan the thread before posting.

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