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Get list of Full mailbox, Send As, Send on Behalf of Permissions in Office 365

Posted on February 23, 2021 By rich No Comments on Get list of Full mailbox, Send As, Send on Behalf of Permissions in Office 365
Problem

You need to list all full, send as and send on behalf of mailbox permissions for a user in Office 365

Solution
$user = "username"
$Mailboxes = Get-Mailbox
#List mailboxes with full access
$Mailboxes | Get-MailboxPermission -User $user
#List mailboxes with Send As right
$Mailboxes | Get-RecipientPermission -Trustee $user
#List mailboxes with Send On Behalf Permission
$Mailboxes | ? {$_.GrantSendOnBehalfTo -match $user }
Reference, Links and Imges

 https://www.michev.info/Blog/Post/1516/quickly-list-all-mailboxes-to-which-a-particular-user-has-access

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