Enable the from field in Outlook There are times when you might need to send an email from an account that is different than your normal email account. To make the from field accessible: 1. Start composing a new message by clicking on "New Email" 2. Click on the "Options" tab 3. Click on the "From" button, which will enable a new dropdown menu on the composer window. 4. You will then be able to add the secondary mailbox and send as that account, using the "Other E-mail Address..." option. Once you have added the mailbox as an option, it will remain there for use in the future.