Add Secondary SMTP

Adding secondary SMTP users to synchronize with Active Directory

 

Synchronized objects in Active Directory, we can not make any changes in Exchange Online.
To add a user for secondary SMTP example:

charles.santana@supportbrazil.com as primary SMTP and
csantana@supportbrazil.com as secondary SMTP

Access:

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Then select the object:

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Right / Properties / Attributes

Locate ProxyAddress

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add secondary SMTP:
SMTP: csantana@supportbrazil.com

Ok in all screens can force synchronization or wait for the normal period synchronization of Exchange Online, it also serves to distribution groups.