FW: Returned mail: see transcript for details

Are the @postgresql.org addresses supposed to work?

-----Original Message-----
From: Mail Delivery Subsystem [mailto:MAILER-DAEMON(at)mail(dot)postgresql(dot)org]
Sent: Monday, November 13, 2000 4:13 PM
To: ler(at)lerctr(dot)org
Subject: Returned mail: see transcript for details

The original message was received at Mon, 13 Nov 2000 17:13:15 -0500 (EST)
from lerami.lerctr.org [207.158.72.11]

----- The following addresses had permanent fatal errors -----
<momjian(at)postgresql(dot)org>
(reason: 550 5.1.1 User unknown)

----- Transcript of session follows -----
Message delivered to mailing list <pgsql-hackers(at)postgresql(dot)org>
Message delivered to mailing list <pgsql-committers(at)postgresql(dot)org>
... while talking to localhost:
>>> RCPT To:<momjian>
<<< 550 5.1.1 User unknown
550 5.1.1 <momjian(at)postgresql(dot)org>... User unknown