Managing Office 365 mail with PowerShell

Like: Now you can add resource mailboxes through the new Office 365 UI

Dislike: They seem to have removed the ability to manage secondary proxy addresses through the UI.

So. To setup the connection to manage mailboxes through PowerShell, do the following:

  • $cred= Get-Credential (Enter your organizational account details in the dialog box)
  • $s = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $cred -Authentication basic -AllowRedirection
  • Import-PSSession $s

There we go, cmdlets available. Now, to set addresses, do:

  • Set-Mailbox <email> -EmailAddresses,,

(Uppercase SMTP denotes a primary address)

To allow a user to access this mailbox, do:

  • Add-MailboxPermission -Identity <mailbox> -User <user to access mailbox> -AccessRights FullAccess

To allow a user to send from a mailbox:

  • Add-RecipientPermission <mailbox> -AccessRightsSendAs -Trustee <user>

(This is the same as the on-prem Add-ADPermission <mbx> -User <user> -ExtendedRights SendAs)

(Thanks to Peter Schmidt @

This entry was posted in Aide memoire, Email, Powershell and tagged , , . Bookmark the permalink.

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