[Pkg-mailman-hackers] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host www.confidesk.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<jsmith999 at confidesk.com>: host chwww1.confidesk.com[5.148.173.215] said: 550
    5.1.1 <jsmith999 at confidesk.com>: Recipient address rejected: User unknown
    in virtual mailbox table (in reply to RCPT TO command)
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