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My apologies not addressing the issue correctly .but you have given the solution I am looking at. <br />
following is the one i am looking .hotmail just a example . i want to block all external mail except my email domain.this will craete any additional blockneck ? coz it rejecting ? <br />
<br />
so in this way i can put the mail to block in the rule <br />
<br />
If you dont want users to send emails to @hotmail.com / @yahoo.com - you can setup a Transport rule and notify the sender, that this is a violation of company policy.<br />
<br />
cur
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My apologies not addressing the issue correctly .but you have given the solution I am looking at.
following is the one i am looking .hotmail just a example . i want to block all external mail except my email domain.this will craete any additional blockneck ? coz it rejecting ?

so in this way i can put the mail to block in the rule

If you dont want users to send emails to @hotmail.com / @yahoo.com - you can setup a Transport rule and notify the sender, that this is a violation of company policy.

cur

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We have some of the users communication with internal (within company- @abc.com ) &nbsp;. how can I achieve this . Just I am thinking &nbsp;putting transport rule on this . is that the correct way to go . we have only 10to 15 users in that category.we don't want these users to get access to external mail(internet &nbsp;like hotmail.com)<br />
<br />
cur 
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</div>


We have some of the users communication with internal (within company- @abc.com )  . how can I achieve this . Just I am thinking  putting transport rule on this . is that the correct way to go . we have only 10to 15 users in that category.we don't want these users to get access to external mail(internet  like hotmail.com)

cur 

Exchange 2010 internal Mail Only

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.