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Q: What is the best way to go about this adding a smiley face for satisfied and a frowny face for disatisfied to a simple email survey?
Short A: CTAs
Longer A:
While there are a variety of solutions to achieve your outcome, as @Josh pointed out, CTAs will probably the easiest. You can add images to CTAs as needed. (see image)
Please include @MFJLabs if you’d like me to respond.