I'm having this issue, as well. Getting that "Hold On" message complaining that I need to use a correct e-mail format (I would assume I am using that already: name@email.com) and wants a template or some such thing. I used the magic e-mail element and the lilac theme. Do you need Responsive E-mail Designer to actually use this?
SAME ANSWER AS IN YOUR OTHER THREAD
Just shout out
Send form file to me or post link to it here
NEW TO "COFFEECUP SITE DESIGNER" FOUNDATION 6 FRAMEWORK?
STUCK ON SOMETHING?
LEARNING & UNDERSTANDING "THE HOW TO"? THE WHY'S & THE WHEREFORE'S?
WITH WAYAN'S STEP BY STEP TUTORIALS
A simple quick way to contact me
https://mawarputih.coffeecup.com/forms/contact-wayan/