How to Send an Email from a Different Mailbox or Alias

Choose which address a message goes out as, when you have access to more than one — your own aliases, a shared team mailbox, a department mailbox, or (for admins with org-wide access) another member's mailbox.

Before you start

You need access to more than one sendable address for the From: control to appear at all — with only your own primary mailbox, there's nothing to choose.

Steps

1. Start a new email (or a reply/forward).
2. At the top of the compose window, click the From: button. It shows your currently selected address.
3. A searchable picker opens, grouped by My Mailboxes, Aliases, Shared Mailboxes, Department Mailboxes, Job Type Mailboxes, and (for members with org-wide access) All Member Mailboxes. Type to search by address, mailbox name, or the person it belongs to.
4. Click the address you want to send as.

What you'll see

The From field updates, and the message's signature/header template switches to match the identity you picked (an alias keeps whatever identity it's already on — picking an alias doesn't change the template). Send or save the draft as normal; the message goes out — and, for a shared or department mailbox, replies come back — under the address you chose.