Email, Messaging, & Video Calls Email How to Use Text Formatting and Images in Mac OS X Mail Signatures Create a better signature in OS X 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 on January 20, 2020 Email Yahoo! Mail Gmail Tweet Share Email Different signatures for different accounts and even random signatures per account—which you can accomplish easily in Mac OS X Mail—are nice. But what about custom fonts, colors, formatting, and maybe images? Fortunately, black Helvetica is not all the formatting Mac OS X Mail can muster. Instructions in this article apply to Mac OS X 10.4 (Tiger) and later. How to Use Text Formatting and Images in Mac OS X Mail Signatures To add colors, text formatting and images to a signature in Mac OS X Mail: Select Preferences under the Mail menu at the top of the screen. The keyboard shortcut is Command+, (comma). Go to the Signatures tab. Highlight the signature you want to edit. You have several options for formatting the text in the right window: To assign a font, select Format | Show Fonts from the menu and select the desired font.To assign a color, select Format | Show Colors from the menu and click the desired color.To make text bold, italic or underlined, select Format | Style from the menu, followed by the desired font style.To include an image with your signature, use Spotlight or Finder to locate the desired image, then drag and drop it to the desired location in the signature. Go to the Composing tab in the preferences window. Make sure Rich Text is selected under Message Format: for formatting to be applied to signatures. For more advanced formatting, compose the signature in an HTML editor and save it as a web page. Open the page in Safari, highlight all and copy. Finally, paste into a new signature in Mail. This will not include images, which you can add using the above method.