Microsoft allows you to create a signature to be included with all emails. 

Outlook App:

Chose “Preferences” then “Signature” under the Outlook option:

Click the “+” icon to add a new signature. Create your signature and click “Save”

Outlook Webmail:

1. Click on the gear icon located on the top right of your menu bar:

2. Choose “Mail” and then “Compose and Reply”. Create your signature.