AOL started bouncing emails from my mail server with the following error:
521 5.2.1 : AOL will not accept delivery of this message. 554 5.5.0 Remote protocol error
On the troubleshooting page AOL asks for specific error code but all I get is a generic message. The emails are sent from Outlook, without any attachments. I don't send out any mass email/newsletters, only personal email.
What can cause this and how should I proceed? Without the specific code I can't proceed with AOL. Have anyone had this problem?