[Linux-cluster] DSN: failed (Delivery reports about your e-mail)

[Mailbot for etexusa.com]

This is a Delivery Status Notification (DSN).

I was unable to deliver your message to
pgmarshall at worldnet.att.net.

I said 
  RCPT TO:<pgmarshall at worldnet.att.net>

And they gave me the error;
  551 not our customer

 
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