I can't answer these questions - I have not seen the returned emails.
They are reported by other people.
I have now managed to get hold of a copy of the returned email. Hope this helps.
----- The following addresses had permanent fatal errors ----- <*****@******.***> (reason: 521 5.2.1 : (HVU:B2) http://l.facebook.com/l/QAQF5HsS-AQGBczQcmf-avvoHdtkMlJ-MYf893FqCJMslKQ/postmaster.info.aol.com/errors/554hvub2.html)----- Transcript of session follows ----- ... while talking to mailin-01.mx.aol.com.: >>> DATA <<< 521 5.2.1 : (HVU:B2) http://l.facebook.com/l/QAQF5HsS-AQGBczQcmf-avvoHdtkMlJ-MYf893FqCJMslKQ/postmaster.info.aol.com/errors/554hvub2.html 554 5.5.0 Remote protocol error
Thank you for getting back to me. Sorry we are on different times. It was a little passed midnight when I received your latest response. I looked into this error and I have a few questions so that I can clear things up .1) Is your primary email address and AOL account?2) Are people sending you mail using your Facebook email address?(if you have FaceBook)3) What email address are the people sending you mail from? Their @If people are sending to your Facebook tell them not to do that anymore and to send directly to your AOL mail address. I have read that Facebook might be doing away with their email address anyway.
At any rate, if it is not something related to Facebook then there is some sort of web link that your contacts are adding to their message that is causing the AOL system to block the mail. A website link, or an email address pr some sort of text is common in all the mail being sent to you that is causing the AOL filters to block it.
If you were to have someone send a message to your AOL address with nothing in the body or just a simple Hello, it should go through. So to solve the problem have them strip down all attachments or links/urls that may be in the body of the message and then slowly add back content until they find what is causing the trigger. Once you do find the culprit and it is necessary to include it in the mail you would have to contact AOL support to have them look into removing it from the filter. AOL support is the only one that can change the filter so that the mail is no longer blocked.