I agree with Charlie. We tend to contrain the width of our emails from 550 to 600 pixels wide for mobile users. We try to make it into a skinny email as much as possible.
You absolutely can, Monica. Simply ask your developer to format your email template. I think "above the fold" constitutes less than 600px in height on most browsers.
However, I caution against going that route due to the rising popularity of email being viewed on mobile devices. It's very hard to scroll through a landscape email on a small screen and generally it's not best practice to go wider than 800px on emails.
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