We have Microsoft Standard Exchange 2007. Sometime recently we have suddenly lost the ability to receive emails from AOL. As far as I can tell, we are receiving all other email normally.
The only anti-spam solution we use is a blocklist from zen.spamhaus.org. I've temporarily disabled it with no change. I didn't think it would make a difference anyway since the aol servers don't appear to be in zen.
We use OpenDNS as our DNS provider, but it's not blocking aol.com.
We are able to SEND to aol.com and these messages are received so it's not like they are blocking our domain.
UPDATE 1: Here's a typical aol log (I chopped out the IP's and other stuff):
,>,250-mail.mydomain.com Hello [126.96.36.199],
250-AUTH GSSAPI NTLM,
250-X-EXPS GSSAPI NTLM,
<,MAIL From: SIZE=8356995,
,250 2.1.0 Sender OK,
,250 2.1.5 Recipient OK,
,354 Start mail input; end with .,
,,SMTPSubmit SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender AcceptRoutingHeaders,Set Session Permissions
,>,"220 mail.mydomain.com Microsoft ESMTP MAIL Service ready at Tue, 18 Aug 2009 14:37:45 -0400",
UPDATE 2: Using the Microsoft Troubleshooting assistant, the mail tracking results for a specific email gave this error message:
550 5.2.0 STOREDRV.Deliver: The Microsoft Exchange Information Store service reported an error. The following information should help identify the cause of this error: "MapiExceptionNamedPropsQuotaExceeded:16.18969:23010000, 17.27161:00000000E4000000000000000000000000000000, 255.23226:00000000, 255.27962:7A000000, 255.27962:56000000, 255.17082:00090480, 0.16993:80030400, 4.21921:00090480, 255.27962:FA000000, 255.1494:00000000, 255.26426:56000000, 4.6363:0F010480, 2.31229:00000000, 4.6363:0F010480, 2.22787:00000000, 2.22787:00000000, 2.22957:00000000, 2.19693:00000000, 2.17917:00000000, 2.27341:00000000, 2.22787:00000000, 4.5415:00090480, 4.7867:00090480, 4.4475:00090480, 4.4603:00090480, 4.5323:00090480, 5.10786:000000004E414C2D4D41494C303100100F010480, 255.1750:00090480, 0.26849:00090480, 255.21817:00090480, 0.24529:00090480, 4.18385:00090480".