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I would have a user created and it would referance user@domain1.com, able to send AND receive?
i could then create a second user account and it would referance the user@domain2.com account, able to send AND receive?
just as long as user@domain2.com is NOT referanced in the first user account?
if you wanted to you could leave all the domains setup for every user, and they could recieve email from all domains but they will ONLY respond out as the domain you have set as primary (determined in AD)