Recognize your own email addresses
I recently received an email from another AOL subscriber [diggeology@aol.com]. When I tried to respond to it, I received a "MAILER-DAEMON@aol.com" notice that "552: 1 Requested mail action aborted, mailbox not found"
In case you're wondering [or even care] why people are leaving AOL in droves, here you go.

-
Alex Stephens commented
This happens with all mail providers. What causes it is when the sender "spoofs" or forges the reply-to address. In that case, the message appears to come from an address that, in reality, does not exist. When you then attempt to reply, the mail server for the sender's domain (in this case, AOL), replies with a "bounce" message. Response code 552 means "Couldn't find a mailbox for that user.". I hope this helps to explain what happened. It is not specific to any given provider, so it could happen with any service.
-
CLARENCE E WINEINGER commented
same problem
-
CLARENCE E WINEINGER commented
very critical
-
CLARENCE E WINEINGER commented
same problem