Returned mail: User unknown

[Mail Delivery Subsystem <MAILER-DAEMON@xxxxxxx>]

The original message was received at Mon, 1 Feb 1999 21:08:10 -0500 (EST)
from root@localhost

*** ATTENTION ***

An e-mail you sent to an Internet destination could not be delivered.

The Internet address is listed in the section labeled:
 "----- The following addresses had permanent fatal errors -----".

The reason your e-mail could not be delivered 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 the e-mail
administrator or Postmaster at that destination.


   ----- The following addresses had permanent fatal errors -----
<bmw-digest@domain.elided>

   ----- Transcript of session follows -----
... while talking to mir.intercenter.net.:
>>> RCPT To:<bmw-digest@domain.elided>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
550 <bmw-digest@domain.elided>... User unknown

   ----- Original message follows -----