You know how different browsers display Web pages differently? From a development standpoint, it takes some massaging and understanding the shortfalls of various browsers to get a page to display the way you would like. When it comes to HTML email, getting your message to display as you would like is a bit more complicated. Web browsers (IE, Firefox, Safari, and Chrome) all use the code you write to display a page verbatim. Email clients, on the other hand (Outlook, Hotmail, Apple Mail, Yahoo Mail, Gmail, etc.), insert, update, and neglect code that the developer writes.
Notes and news, insights and inspiration from the autonomous collective mind of GS.