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Stripo.email - FREE Email Template Builder: Drag and Drop
all email templates designed in stripo html email editor become responsive on mobile by default. in case you need advanced customization, we have developed a set of tools to let you easily change the appearance on mobile point-by-point without any fuss.
thanks all. after all of that, i had a spark of an idea and am in the middle of writing my own. it's obviously not as robust as the software you've pointed to, but it will let my client load up the content herself (email subject line, body text, template style) based on a set of templates i create.