The best dimensions for an email blast is less than 500-600 pixels wide by 800-1000 pixels tall. The reason you want to stay within those dimensions when sending an email blast is that most of your recipients will be on a screen 1024-1280 pixel wide. If they are using Outlook, the preview pane ends up being around 690 pixels wide. By properly formatting your email blast design, you will ensure readability.
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