Internet, Networking, & Security Web Development How to Integrate HTML Into Your Yahoo Mail Signature Make your signature stand out with HTML in Yahoo Mail By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated January 09, 2020 Talaj / Getty Images Web Development CSS & HTML Web Design SQL Tweet Share Email You don't need to know any HTML to add custom formatting to your Yahoo Mail signature. In fact, Yahoo Mail lets you integrate HTML into your signature to add links, adjust the font size, and more with just a few mouse clicks. Instructions in this article apply to the standard web version of Yahoo Mail. Yahoo Mail Basic and the Yahoo Mail mobile app do not support HTML. How to Use HTML in Your Yahoo Mail Signature To add HTML formatting to your email signature in Yahoo Mail: Select the gear in the upper-right corner of the window, then choose Settings. Select Accounts. Select your Yahoo email address. In the Signature section, select the Append a signature to the emails you send check box. Formatting Format the signature using the HTML toolbar. Options include: Change the style and size of the font.Make text bold.Italicize text.Change text color or adding highlights.Make a list of bulleted items.Make an ordered list with numbers.Change text alignment.Insert a hyperlink into your signature. It's even possible to include pictures in your Yahoo Mail signature. Select Save when you're finished. Your stylized signature will now automatically appear at the end of emails you send.