When you open Featurevote you now land on People. It lists everyone who was active on your board in the last 30 days and puts the ones waiting for a word from you at the top. Someone's first request is marked so you can welcome them. Each person has a Reply button. What you write goes to them as an email from you, with your name on it, and if they answer it lands in your inbox. Nothing about the exchange shows on the public board.
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This board runs on Featurevote. You can make one for your own project. There is a free plan.