Returned mail: User unknown

The original message was received at 2002-06-29 10:01:21 +0200
from postoffice. [10.0.0.1]

—– The following addresses had permanent fatal errors —–
<boj@ryn.de>

—–Transcript of session follows —–
… while talking to postoffice..:
>>> RCPT To:<boj@ryn.de>
<<< 550 5.1.1 unknown or illegal alias: boj@ryn.de
550 <boj@ryn.de>… User unknown

Joachim Blank Aug. 25 2002 01:00Reply

The original message was received at 2002-08-26 00:09:49 +0100
from postoffice. [10.0.0.1]

—– The following addresses had permanent fatal errors —–
<michael@michaelsmith.ms>

—–Transcript of session follows —–
… while talking to postoffice..:
>>> RCPT To:<michael@michaelsmith.ms>
<<< 550 5.1.1 unknown or illegal alias: michael@michaelsmith.ms
550 <michael@michaelsmith.ms>… User unknown