Error message?

[Johan Stålnacke]

Why do i get this error message everytime i post
to the list??

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Subject: Returned mail: User unknown

The original message was received at 2004-01-27 15:31:24 -0800
from postoffice.apple.com [10.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<listadmin at lists.apple.com>

   -----Transcript of session follows -----
... while talking to postoffice.apple.com.:
>>> RCPT To:<listadmin at lists.apple.com>
<<< 550 5.1.1 unknown or illegal alias: listadmin at lists.apple.com
550 <listadmin at lists.apple.com>... User unknown
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I'm sending my post to bf1942 at icculus.org