Apple is making it ever harder to create a custom HTML email signature on its native Apple Mail app with the latest OS X 10.10 (code name: Yosemite). But this detailed tutorial by Matt Coneybeare will allow you to customize it, with some HTML knowledge.
![HTML email signature on Apple Mail for OS X Yosemite](https://i1.wp.com/www.sunarlim.com/wp-content/uploads/2014/12/mail_icon_large.png?fit=121%2C126&ssl=1)
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