big problem with SPAM

Hello,

I do a tail -f /var/log/exim_mainlog and I get..

2005-11-01 19:38:52 H=(n4a.bulk.scd.yahoo. com) [66.94.237.38] F=<sentto-4012611-280130-1130882778-gpatxi=siteinmyserver. com@returns.groups.yahoo .com> rejected RCPT <gpatxi@siteinmyserver .com>: Unrouteable address
2005-11-01 19:38:52 H=(n8.bulk.dcn.yahoo .com) [216.155.201.61] F=<sentto-4166736-229188-1130879492-gpatxi=siteinmyserver. com@returns.groups.yahoo. com> rejected RCPT <gpatxi@siteinmyserver. com>: Unrouteable address
2005-11-01 19:38:52 H=(n2a.bulk.scd.yahoo .com) [66.94.237.36] F=<sentto-341162-45588-1130879619-gpatxi=siteinmyserver. com@returns.groups.yahoo. com> rejected RCPT <gpatxi@siteinmyserver. com>: Unrouteable address
a lot of emails, and don't stop! They still running and overloading my server...

Exist any way to block gpatxi@siteinmyserver. com to in / out of my server?

I searched in google about gpatxi and is a spanish-man that lives sending spam.

And the email account "gpatxi@siteinmyserver. com" don't exist.

Help pleaseeeeee! big problem with SPAM

How can I stop it?

Thank you very much!

edit:

I created an email account called: gpatxi@siteinmyserver. com to receive the emails...
and they are ALL emails of list accounts created at yahoo groups, subjects of some emails:

[A1 Home Biz] Earn high daily returns on your investme...
[1_more_safelist] About Get-Paid-To-Read-Email sca...
[1-list-for-all] Easiest money I have ever made - 30K ...
[1-to-1] Easiest money I have ever made - 30K in your ...
[1Business_Opp_Gold] Easiest money I have ever made - ...
[123Work_at_home] Easiest money I have ever made - 30K ...
[10DaysDouble] Easiest money I have ever made - 30K in ...
[100percentFREEMoney] Easiest money I have ever made - ...
[3MoonsDiscussion] Making money has NEVER been so ...
[0-newbies] GUARANTEED UNBELIEVABLE MONEY LOOPHOLE ...
[Ads_Unlimited] Build A Lifetime Residual Income!
[0-postfreeadz] Who is this Internet Renegade?

They are arriving about 120 or 200 by minute...

 

 

 

 

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