Did you read this entire thread? If not, please do. If you did, I'm not sure how anyone can make this any more clear.
Mailto links are an archaic way to handle this and two years later it's even more archaic. This is not an InDesign issue and there is nothing that is going to change that. There are too many email clients, too many PDF readers, and too many web mail platforms.
It's obviously not what you want to hear, but it was the answer two years ago and it still is.
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