We avoid using DIV tags during the email developing because they’re not fetched by many email clients like Gmail, Yahoo, Hotmail, Outlook, etc. As you can imagine, that takes away a significant portion of your market, which is why we use table tags instead: we want you to reach the maximum amount of people with your emailer templates. We recommend that designs should be 600 pixels or less. Any larger than that and you’ll have trouble getting your email template to fit in the emails of most email clients.