Neither Microsoft Outlook 2011, 2016, 2019, nor 365 for Mac offer creation of email signatures from HTML. Only a rich-text editing box is provided, without the ability for more customization. HTML Email Signature - Outlook enhances these capabilities by allowing customized creation of email signatures from HTML. Simply type in a name for your signature, add your HTML, and your signature is created! A button to preview the HTML is also available. ** READ BEFORE PURCHASING ** - Valid HTML must be provided. This is not a design utility. Issues with formatting and/or appearance of the final signature are directly tied to the HTML code. - An installed version of Microsoft Outlook (2011, 2016, 2019, 365) is required for this application to function.