Transport Rule block emails except for certain domains

I have a user not allowed to send email, I need to allow him to send to 3 domains only
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uaeabudhabi77Author Commented:
I confirmed from microsoft ist not possible by exchange design.
Glen KnightCommented:
It can be done and my guide explains how.
Following an 'Objection' by demazter (at to the intended closure of this question, it has been reviewed by at least one Moderator and is being closed as recommended by the Expert.
At this point I am going to re-start the auto-close procedure.
Thank you,
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