I have a question for you, and please be honest. When was the last time you checked which email clients are most commonly used by your mailing list? If your lists look anything like mine, you'll be surprised to see that iPhone has far-and-away the highest percentage of users, with Hotmail trailing behind and Gmail somewhere in the single digits (gasp!).  The chart below represents the breakdown of email clients for one of my biggest brands.

Shocking, right? A report by Campaign Monitor suggests that mobile email use has grown from four percent of the market to 20 percent in two years. The bottom line is, if you're not optimizing your

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