I configured Outlook with (as near as I can tell) the correct IMAP/SMTP for my AOL account but it will not send or receive messages. Works fine with my Mac mail account, but not with AOL.

When I try to send a test message to myself, it returns the error: "Undeliverable ... 553 5.7.1 ... Relaying denied, try authenticating."

Is this fixable? I'm out of ideas.