How to set up Send-As rights to a non-mailbox object in Office 365

Summary
You want to use Send-As rights to a non-mailbox object such as a Mail Contact or Mail User object in Microsoft Office 365.

Note This practice is typically not recommended because it can be considered as spoofing when the message originates from a site not native to the mailbox. However, there still may be a business need for this kind of user right.

Resolution
To set up Send-As rights to a non-mailbox object, follow these steps:
  1. Create a mail-enabled object, and then let it to flow over through Microsoft Managed Services Service Provisioning Provider (MMSSPP). This object can be either a Mail Contact or Mail User object.
  2. Set the permissions by using one of the following Remote PowerShell commands when the item syncs with the managed environment. (The Customer Management Portal and Exchange Admin Center do not let you add Send-As rights for Mail Contacts or Mail Users.)

    Note You must be a member of the Mailbox Permission role-based access control (RBAC) role groups. 
    • Get-MailContact –Identity User@domain.com | Add-AdPermission –User Domain\User –AccessRights ExtendedRight –ExtendedRights Send-As 
    • Get-MailUser –Identity User@domain.com | Add-AdPermission –User Domain\User –AccessRights ExtendedRight –ExtendedRights Send-As
Properties

Article ID: 2905758 - Last Review: 08/11/2016 12:22:00 - Revision: 5.0

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