@lispi314 @PurpCat @dalias @Obdurodon @jeff ProtonMail sounds too much like a honeypot at this point. It's also the most popular email service that at least claims to respect your privacy, so of course glowies are going to get their hands on it one way or the other.
I would recommend either Posteo (they accept cash via mail) or cock.li (if you can get an invite). You can also host one yourself if you have the knowledge and the major email companies haven't blacklisted your IP range.