I also love the proton family, as well as tutanota, if you don't know it... to put a but to the 2 best email services is that they have disabled the option of IMAP and SMTP making it impossible in its free version the use of email managers Thunderbird style. But of course they have to live off of something, apart from the fact that it adds security to the protocols and ultimately to your email. For the rest it is a fantastic option, I'm going to catch up a little and in not long I would like to do an article on the subject.