How to install your email signature in Polymail on iOS Sebastien Barrau April 20, 2018 18:58 Updated You can download Polymail for free on the App store. Related articles How do I add an email signature in Outlook 2016 for Mac? The text you typed is too long. Please shorten it and try to save it again. How to install your email signature in Outlook for iOS How do I add a signature to Apple Mail on iOS? How do I add a email signature to Outlook 2003-2016 ? Comments 0 comments Please sign in to leave a comment.