[Mailman-Users] Error comfirming subscription from Mailman

[Feng Jeffrey]

After I installed Mailman on my FreeBSD server, I created a test list and
sent a subscription to it, the server returned the folowing error message.
What causes this problem? Any help will be appreciated. Jeffrey

--------------------------------------
The original message was received at Tue, 7 Jan 2003 16:16:41 -0800 (PST)
from localhost [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<test-request at listserv1.whittier.edu>
    (reason: 550 5.1.1 <test-request at listserv1.whittier.edu>... User
unknown)

   ----- Transcript of session follows -----
... while talking to listserv1.whittier.edu.:
>>> DATA
<<< 550 5.1.1 <test-request at listserv1.whittier.edu>... User unknown
550 5.1.1 <test-request at listserv1.whittier.edu>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)