Send From A Shared Mailbox
Introduction
Before you can send from a Shared Mailbox, there are a couple of steps you need to follow.
By "send from" I mean send from the mailboxes email address i.e. ITSupport@kvikmanagement.co.uk
By default, you won't have the option to send as the mailbox, only your own address.
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Open Outlook.
Create a new email
On the "Options"Â tab and make sure that the "From" field is available when creating new emails:

On the "From" dropdown, select "Other email address".

Type the full address and press enter. It will look for the address in the global directory and add it.

It will then allow you to select it in future emails that you send from the shared mailbox.