[Mailman-Users] error sending to mailbox

[john doe]

I get the following when trying to send to the any Mailman list mailbox:

<staff at somedomain.com>: data format error. Command output: staff: Mailbox
    does not exist

Reporting-MTA: dns; somedomain.com
Arrival-Date: Tue, 30 Sep 2003 10:22:22 -0700 (PDT)

Final-Recipient: rfc822; staff at somedomain.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; data format error. Command output: staff: 
Mailbox
    does not exist

Any ideas?

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