Exchange 2010 internal Mail Only

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
curAsked:
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sunnyc7Connect With a Mentor Commented:
If you install Exchange 2010 properly, your users can send emails internally as well as externally.

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.

See here
http://www.msexchange.org/tutorials/Transport-Rules-Exchange-Server-2007.html

OR you can block access to hotmail via firewall
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I am really not clear what your question is ? Can you explain what you are trying to do
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curAuthor Commented:
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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sunnyc7Connect With a Mentor Commented:
You can setup transport rules according to that article.

It's better to set it up for hotmail / yahoo / gmail (big3).
When  users start getting automatic alerts - they know they are being watched and you can put a note - that your last action was logged in the system for compliance purposes :).

People stop emailing after that.
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curAuthor Commented:
thank you
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