There are a number of functions that you need to use PowerShell to do in Office 365.

One of these functions is to grant ‘SendAs’ permissions to mailboxes, as the web gui does not allow you to do this.

This guide will teach you how to grant ‘SendAs’ permissions to a mailbox using powershell.



You need to get the following information before you create the shared mailbox:

Variable Value (example shown)
<shared mailbox alias> sharedmb1
<user display name requiring sendas permission> Test User1


This is the simplest method to create a shared mailbox. If you are going to be creating a lot of these, you might be best checking out the best practice method.

Grant ‘SendAs’ Permissions to a Mailbox

Add-RecipientPermission <shared mailbox alias> -Trustee "<user display name requiring sendas permission>" -AccessRights SendAs


Add-RecipientPermission sharedmb1 -Trustee "Test User1" -AccessRights SendAs


To access these mailboxes you are going to need to assign permissions to your user account. Click on the related links below to complete your goal:


Modern Melee can help you with your administration of Office 365 cloud services.  Click here for more information.
This is my site Written by Tim Jolley on March 12, 2012 – 2:41 pm