You need to have an e-mail client configured to open mailto: links. Failing that, manually copy-paste the e-mail address wherever you send e-mail from.
Well, you kinda need a permanent address attached to your account, so itch.io staff can use it to identify you. It's also handy if you lose your password or anything.
thanks for doing your part hopefully the itchio team can figure out how to handle these in a timely manner or tell people WHY they are being put on this list in the first place and how to avoid it