If you aren’t testing your emails before you send them out, you risk poor formatting for some of your readers. This is especially true when you are talking about Outlook and some of the mobile apps. I’ve previously blogged about Outlook’s image constraints. It’s easy to forget such things if you don’t use those apps yourself.
Email on Acid is a decent service. I’d give them 3½ stars. I really wish they had more mobile coverage. And it’s not as fast or easy to use as I’d prefer. But it gets the job done. And if you sign up using the promo code 30PROMOEB, you’ll get 30% off. That’s over $100 savings. Not a bad return for a basic web search.