[Linux-cluster] DSN: failed (Message could not be delivered)

[Mailbot for etexusa.com]

This is a Delivery Status Notification (DSN).

I was unable to deliver your message to
guhantex at eth.net.

I said 
  RCPT TO:<guhantex at eth.net>

And they gave me the error;
  550 5.1.1 unknown or illegal alias: guhantex at eth.net

 
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