Has anyone else received one of these?

From: root@all.net (root)

A user at your site has just attempted to telnet into our site without proper authorization. We consider this inappropriate behavior and would like an explanation of this action as soon as possible.

This message is generated automatically at the time of the attempted entry and is sent to our administrators and the postmaster at the machine making the attempt. We have included any information provided by your ident daemon (if in use) on the subject line of this message. We also do a reverse finger for future reference.

Fred Cohen - fc@all.net - tel:US+216-686-0090