unknown user send to non exist email account

From: Geoff (poochie@asia1.com)
Date: 03/31/02 

From: "Geoff" <poochie@asia1.com>
Date: Mon, 1 Apr 2002 02:28:18 +0800

hi all,
Recently I received a chain of emails from unknown user to my mail server
(linux 7.2 sendmail). All emails were forwarded to my postmaster as all
intended recipients/email accounts he tried to send to does not exist. Is
this called spam? How do I stop this people to keep doing this to my mail
server?

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