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What you want is called responsive design and there's a lot of literature around the web about it. You should check out templates.marketo.com for some responsive templates which you can download and use for your own emails.
An easy way to control this is the limit the width of each email to 600 pixels, and only have a one column approach to the email template. Also keep the email text size to 14pt or higher.
I hope this helps.
Similar to Kenny's response, you can declare some media queries with max widths in your email css. This will cause your emails to adapt to the screen size (desktop v mobile) instead of you having to create two versions.