Fw: Mail delivery failed: returning message to sender

[revevilgod at gmx.com]

> This message was created automatically by mail delivery software.
>
> A message that you sent could not be delivered to one or more of
> its recipients. This is a permanent
> The following address failed:
>
>     owner at lists.cpunks.org:
>         SMTP error from remote server for RCPT TO command, host: mail.pglaf.org (65.50.255.19) reason: 550 5.1.1 <owner at lists.cpunks.org>: Recipient address rejected:


Why? No owner ?