Set a signature for outgoing email in Outlook for Mac!: Outlook ❯ Settings ❯ Email ❯ Signatures to open the Signatures window. The Standard signature will show. For a new signature click ‘+’ to open that window. Give it a name and type the signature in the box below then click ‘Save’ above. Under ‘Choose default signature’ select the new signature for New messages and Replies/Forwards as wanted