This is the email I received from an AOL Tech.
"If the undelivered e-mail originates from an Internet address, and Mail Controls are set to allow Internet e-mail, there are several steps you can take.
- Please contact the sender of the e-mail to verify they have
the correct e-mail address (screenname@aol.com).
- If the sender has the correct e-mail address, please ask
them try to send the e-mail again.
- If there are difficulties sending the e-mail again, please have
the sender contact the Postmaster of their domain (for
example: AOL Members would contact
postmaster@aol.com). The Postmaster will check for any
e-mail gateway problems between the sender's Internet
Service Provider (ISP) and America Online.
AOL may have received large amounts of "junk" or "spam" email from someone on this domain name. The addresses of domains that send this type of email to AOL members are added to the Preferred Mail, Blocked List. Because the Preferred Mail, Blocked Sites list is not updated daily to remove domains from the list, it does not immediately display these sites when added.
America Online have a process that goes through our database of open proxies and tests them every 24 hours. If we find that our attempts to use your open ports are unsuccessful, we will change the status of your server from open to closed. We will then remove your IP from our block list and push the changes into production. These processes are automated, and "unblocks" generally occur in about 24 hours.
If you would like to test your e-mail server against our database, enter the IP address on the site below:
http://postmaster.info.aol.com/opse.html
Or you can asked your ISP or ASP to contact AOL at:
703-265-4670"
