How to prevent local to receive email from local address, from outside users

I am receiving Spam from my local address.
They comnnecto to the SMPT server and send email on internal email's
I«m not shure hou to prevent this. I cant remove anonymous autentication on SMPT protocol, because I receive Email on this server. I cant prevent the address because they are used internaly.

So what is the solution?
vss-ptAsked:
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Neil RussellTechnical Development LeadCommented:
THere is a good article on this site about spam prevention with Exchange
< HERE >
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Neil RussellTechnical Development LeadCommented:
Would help if you say what VERSION of exchange when you ask a question too....
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vss-ptAuthor Commented:
I am Sorry, it was cutted out on copy past operation.
It is vesion Versão: 6.5.7638.1 that cames with SBS 2003
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Neil RussellTechnical Development LeadCommented:
Read and follow ALL steps in ALL parts of the following article.

http://support.microsoft.com/kb/324958
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vss-ptAuthor Commented:
The server already doenst alow open relay.

Probaly this as no solution.

The email domain is foe eg. abc.com. Someone is sending though this server messages to the internal mailbox, for eg. to info@abc.com from info@abc.com.

This is anoing because envolves lots os messages
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vss-ptAuthor Commented:
Any Ideas how to solve this issue?
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vss-ptAuthor Commented:
Closing
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vss-ptAuthor Commented:
Solution not found
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