There are a few email client details that can derail the email you worked so hard on. Email clients change your email code before it hits the recipient’s inbox. Sometimes this is to your benefit, and sometimes these edits lead to breaks. Updates to an app are the actual invisible ISP hand that you need to be aware of.
To shed light on how often email apps change, we took a look at the version histories for the biggest players.
Predicting how emails will render on smartphones and tablets can get complicated because there are so many factors involved. Differences between device manufacturers, operating systems, screen sizes and email applications can all impact how your email will render on a mobile device. Just in case desktop and webmail rendering weren’t already giving you enough trouble (we’re looking at you, Outlook), the popularity of mobile has only added fuel to the fire.