SMTP Error from my server?

[Chris Maness]

I have not seen this error before.  What does it mean?  (I will change 
the actual e-mail to protect the address from spam bots).

To: NOSPAMtim at adelphia.net
> From: Mail Administrator <Postmaster@<PostmasterDomain>>
> Subject: Mail System Error - Returned Mail
> Date: Mon, 17 Sep 2007 14:48:17 -0400
> 
> This Message was undeliverable due to the following reason:
> 
> Your message was not delivered because the return address was refused.
> 
> The return address was "<NOSPAMtim at adelphia.net>"
> 
> Please reply to Postmaster@<PostmasterDomain>
> if you feel this message to be in error.

Chris Maness
Sys Admin