Using Mannequin - UWAA/mannequin GitHub Wiki
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Mannequin Templates are tool agnostic, with the code built to the best set of "standards" we could hope to acheive across as many e-mail clients as possible.
That said, the primary tool employed broadcast emails at the University of Washington is Convio Luminate, therefore in certain cases (namely our template files) there is some tight coupling to that system.