Send As [or Send on Behalf] Another mailbox

*******You must have proper access (send as, send on behalf [if applicable]) to utilize this functionality*******

To send as another mailbox, do the following:

1. Log into your Office 365 account, open Outlook, draft a new email or a reply. Go to the options setting and ensure the "Show From" has a checkmark.

2. Click the dropdown arrow next to from, select the account you would like to send as. If you haven't sent as this inbox before, you may need to select "Other email address..." and enter it manually.