Thunderbird is Mozilla's free, open-source email client, capable of sending rich-text messages by using HTML. When you open a Thunderbird message, it operates like most rich-text editors: you select ...

How do I learn to code in HTML and CSS on my Mac? Web design is one of the most useful skills you can learn, and it’s easy to learn HTML and CSS (the two main pillars of web pages) in Mac OS X. In ...

In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.