This is a cool interactive email featuring a falling basketball. This email takes advantage of the thin and tall nature of a mobile email client for its effect.
Apparently fixed positioning support is going away in iOS10. Here's your last chance to
Gmail Supports display:none and Gmail iOS Font Fix Update

One of my most often used hacks is the dash hack or hack to prevent the Gmail iOS app from drastically increasing the font size for certain emails. The technique took advantage of the fact that Gmail doesn't support display:none.
Microsoft’s Slow March To Email Redemption

You might have tuned in to Litmus' "industry changing" announcement at the Litmus Conference that they will begin collecting feedback and bug reports on Microsoft's behalf for the various Outlook email clients. It is so good to hear that Microsoft is taking
CSS Fixed Positioning in Email

Its one of the least understood CSS styles in email and also one of the most quirky - especially when it comes to iOS. The iOS Mail toolbars will obscure fixed positioning elements set to the very edge and z-indexes don't work
Thunderbird’s Quirky Support For Checkboxes

Thunderbird supports checkboxes so it supports interactive email right? Well not so fast. The client behaves strangely when it comes to form elements. This article goes over what you need to know about form element support as well as ways to target
No Absolute Positioning in the Samsung Email Client

Ever since Google discontinued the native Android client, many users on Galaxy phones have turned to Samsung’s email client. This webkit based client – denoted with a red @ seal – comes with some quirks – the lack of absolute positioning a
Responsive Rollover Images for Email

A while back I wrote an article that demonstrated a method to create rollover images in email using background images. However the old method requires the width of the image to be fixed because the background-size property is not uniformly supported by
The Outlook Rosetta Stone

Jason Rodriguez and Ed Giardina dug up from the annals of the internets the Microsoft Office HTML and XML Reference. It contains a comprehensive list of the infamous Outlook (and Office) mso- properties and their uses. This document might one day
The Ultimate Email CSS Animation Guide

Alex Ilhan dishes the dirt on CSS animations in email. Lots of juicy techniques to experiment with.
Part 1: Overview, the pros & cons and examples
Part 2: How to code animations
Part 1: Overview, the pros & cons and examples
Part 2: How to code animations
Gmail Reverts Interactive Email Disabling Change

Well that was quick! A day after Gmail made changes to their CSS filters blocking interactive CSS elements, they've seemingly rolled it back.