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i have opened the relay of my exchange server but this is causing alot of thread on my smtp server ... i want to put restriction on my &nbsp;e mail server <br />
what is the criterea of its <br />
can any body help me <br />
<br />
thanks in advance
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i have opened the relay of my exchange server but this is causing alot of thread on my smtp server ... i want to put restriction on my  e mail server 
what is the criterea of its 
can any body help me 

thanks in advance

Microsoft Exchange Relay

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.