Returned mail: User unknown

[Mail Delivery Subsystem <MA...@aol.com>]

The original message was received at Fri, 7 Jul 2006 02:34:57 -0400 (EDT)
from fe02-umail.mtu.ru [62.5.255.16]


*** ATTENTION ***

Your e-mail is being returned to you because there was a problem with its
delivery.  The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors -----".

The reason your mail is being returned to you is listed in the section
labeled: "----- Transcript of Session Follows -----".

The line beginning with "<<<" describes the specific reason your e-mail could
not be delivered.  The next line contains a second error message which is a
general translation for other e-mail servers.

Please direct further questions regarding this message to your e-mail
administrator.

--AOL Postmaster



   ----- The following addresses had permanent fatal errors -----
<mu...@aol.com>

   ----- Transcript of session follows -----
... while talking to air-xm04.mail.aol.com.:
>>> RCPT To:<mu...@aol.com>
<<< 550 MAILBOX NOT FOUND
550 <mu...@aol.com>... User unknown