A custom email template is an email template that is created specifically for your needs and can be used as the foundation of a new email campaign or autoresponder. Using a template as the basis of your email campaigns ensures that they will look the same each time you send a campaign, because they will be based off the same initial design.
If you've already created an existing custom email template, then you can add a preview image for your template by creating a 247px x 200px GIF image and placing it in the admin/resources/user_template_previews folder. You will need to call it ID_preview.gif, where ID is the ID of your custom email template, such as 4_preview.gif.

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