Exchange 2010 - Apply filter to email sent from outlook

We have migrated domain AA to BB and kept both domains active with a few users/mailboxes being accessed on both.

Condition is to prevent email from domain BB to only a group of users of domain AA - Esp when a users "Reply All" to previous emails when these group of users are marked who should not get these mail.

We tried exchange rule set - sender domain BB to recipients domain AA action drop but no luck as outlook is still delivering email to other outlook users.

Pl. suggest if something on this can be achieved with Mix or solutions.
R RITAsked:
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Try setting the exchange rules on both exchange servers, to me it sounds like it was working as intended however another server was used for the processing of the mail.
R RITAuthor Commented:
Have already tried, here its internal domain users only so exchange is communicating using mapi whereas rules are getting applied to smtp.

How Can i apply rules o it is send from outlook, any custom way or powershell script may work.
Hi R R,

You may find this article a good start:

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