Thursday, August 23, 2012

Troubleshooting AOL/other mail server mail delivery Exchange problems

How to troubleshoot
There's two things you need to do.

1. Make sure that you have a PTR (reverse) DNS record for your mail server. If you don't have one AOL will not accept your mail. It does not have to match the A used for your mail server or your MX record, and doesn't have to make sense.. you just have to have one.

2. Simple troubleshooting steps will tell you exactly what the problem is

From a command prompt (red bits are responses)

c:\nslookup
>set type=mx
>aol.com

Server: Glate's Server
Address: 172.19.0.33

Non-authoritative answer:
aol.com MX preference = 15, mail exchanger = mailin-08.mx.aol.com


>exit

C:\telnet mailin-08.mx.aol.com 25

220-rly-mf08.mail.aol.com ESMTP mail_relay_in-mf08.3; Thu, 28 Jun 2007 12:13:45
-0400
220-America Online (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. Effective immediately: AOL
220- may no longer accept connections from IP addresses which
220 have no reverse-DNS (PTR record) assigned.

HELO GLATE
250 rly-mf08.mail.aol.com OK
mail from: <frank@glate.com>
250 OK
rcpt to: <frank@aol.com>
250 OK
data
354 START MAIL INPUT, END WITH "." ON A LINE BY ITSELF
this is a test
.
421-: (RLY:CH) http://postmaster.info.aol.com/errors/554rlych.html
421 SERVICE NOT AVAILABLE


This is the error I received, yours may be different obviously.. upon visiting the website it tells me that my IP address "has generated AOL member complaints and your mail system may be compromised due to a virus or other security related issue"

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