Issue: AOL.com rejecting mail
AppRiver technicians have noted clients asking if we have any information regarding why AOL.com would be rejecting their e-mails.
The best thing to do in this type of situation is to make sure that your mail server has logging turned on. Afterwards, try sending a test message to an AOL account. In the log files, search for the message. The AOL mail server will usually return a link with the error message. The link will provide information from the AOL.com site as to why the message was blocked.
Sometimes, AOL will not accept e-mail from a server unless that server has a reverse DNS entry in place. To have a reverse DNS setup, you need to contact your ISP and have them create a PTR record to point back to the A record of your mail server. This link has a test to see if your mail server’s reverse DNS is setup: http://www.dnsstuff.com/
In the reverse DNS box enter the IP of your mail server. If a reverse DNS is in place it will be displayed.
For more info from AOL.com, follow this link: http://postmaster.info.aol.com/