Azure Active Directory
An Azure enterprise identity service that provides single sign-on and multi-factor authentication.
13,482 questions
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Can we be able to give one person's userprincipalname value as proxy address for another person?
Is this for on-premises Exchange or Exchange Online? In Exchange Online, there is a "hidden" email address policy that requires at least one proxy address to match the UPN value for the mailbox/user, so the answer is NO.