You can copy an existing signature from Outlook through the clipboard to start from. Non-repudiation The digital signature helps prove to all parties the origin of the signed content. «Repudiation» refers to a signer’s denial of any association with signed content. Then a pop-up form will appear and the user has to fill in the information. IntroductionDespite the abundance of Outlook add-ons and plug-ins for adding letterheads and templates to your emails, MS-Outlook by itself offers an easy way to create and use your own letterhead and message templates. It may not be the way you imagined, but it works.