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Jon BrelieFlag for United States of America

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Limit user to specific recipients or specific domain

Exchange 2010 SP2 Rollup 4.

I have a unique situation where I need to restrict users from sending to anyone that is not a member of a local distribution group  (all in the same email domain).  I want a closed cell of 20 users that can only send and receive from each other.  I have already used delivery restrictions to prevent them from receiving email from anyone else, but now I need to lock down sending.  They must not be able to send to any address outside a specific group, OU, or email domain.  If it helps, I have them broken out into their own GAL that is segregated from the rest of the Exchange org as well.

I had thought that 2010's transport rules could facilitate that, but all of the options I'm seeing would require a negative operator (NOT, NE, !=) and that doesn't appear to be an option.  I hope I'm missing something.  It wouldn't be the first time.

Is there a way to do this?  If so, what would transport overhead look like?  I'm pretty comfortable with EMS so Powershell it up if required.

Essentially, I am looking for an "approved recipients" restriction for a group of users.

Thanks!
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Gareth Gudger
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Thanks Diggisaur,

I guess I should have mentioned that I already have a rule in place to block messages sent to addresses external to Exchange, and that it is working well.  I need to lock it down further to a single distribution group or email domain.  I host several email domains, and want to specify this group is only allowed to email each other.  (Group/OU/emailDomain are unique to this set of users)
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Assigning split points for getting me thinking about exceptions externally.  What I needed were exceptions internally, but this got me pointed in the right direction.