I get a lott off messages like this. Can anybody stop this?

Regards
Svein Pedersen
sysadmin and postmaster on odin.fna.no
sp@fna.no
http://www.fna.no/fna/svein.html


> From MAILER-DAEMON Tue Oct 31 06:16:02 1995
> Subject: Returned mail: User unknown
> To: postmaster
> Content-Length: 1686
> X-Lines: 40
> 
>    ----- Transcript of session follows -----
> While talking to ee.ee.umn.edu:
> >>> RCPT To:<rgroneng@ee.umn.edu>
> <<< 550 <rgroneng@ee.umn.edu>... User unknown
> 550 <rgroneng@ee.umn.edu>... User unknown
> 
>    ----- Recipients of this delivery -----
> Bounced, cannot deliver:
>    <rgroneng@ee.umn.edu>
> 
>   ----- Message header follows -----
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> From: kpneal@eos.ncsu.edu
> Received: by c00888-239rd.eos.ncsu.edu (8.6.9/EC06jan95)
> 	id WAA13585; Mon, 30 Oct 1995 22:37:19 -0500
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> Subject: A3000 SCSI
> To: amiga@netbsd.org
> Date: Mon, 30 Oct 1995 22:37:18 -0500 (EST)
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