Designing HTML Email for Better User Experience and Deliverability
When creating an HTML email for a newsletter, email designers have to consider a lot of things. First of all, they should think about rendering across different email clients and applications.
Fortunately, most email users read email messages only in a few email clients. The recent Litmus report provides statistics on email client usage where you can see that there are only a few major email clients like Microsoft Outlook and Apple and web-based clients such as Gmail, Outlook.com and YahooMail stand out.