Look how many choices you listed.  Proton-to-Tutanota isn't E2EE, so it's only among that provider.  If the person you're talking to is cool enough to use privacy email, they are cool enough to use a REAL private protocol like simplex.  The purpose of email is the people you're reaching out to don't care.  And the businesses you sign up for are forcing you to your account to it.

Also take a step back and think about what you're really standing for right now.  You're literally trying to haze me for telling people to be decentralized and as self-sovereign as they can be .... and you're instead trying to degrade what I'm doing to promote millionare Protonmail.  Like what's your goal?

Clearly we would be in a better place if everyone and their mother had their own VPS with email.  So it's unclear your agenda. 

 His agenda is clear. Check his pfp.
He works for the MI6


lmao 

 What r u even talking about? All these email providers are E2EE. Decryptions only happen on your clients.
But If you don't want to use them, just generate your own keys and send emails using PGP.
You proposing newbies learn how a VPS works, learn how hosting works, learn how cybersecurity works and somehow put everything together themselves is unrealistic and somewhat dumb when simpler more elegant solutions already exists.
 

 First,
If a Protonmail user emails a Tutanota user, it is NOT end-to-end encrypted.

Therefore,
Your solution of there already exists all these options is bullshit, because the options contradict each other.

Further,
It is unclear why a Nostr user, who promotes Bitcoin, (decentralized social media and money), would be opposed to decentralized email.

Finally,
I reject your entire worldview of having people self-host Bitcoin nodes, which add no value to their lives.
Yet, you dismiss people owning a VPS with their communications, emails, docs, files, ect.

Conclusion,
Given your complete failure to acknowledge basic facts, you're essentially spamming.  To say you're worthless would be an improvement, currently you are sucking up my resources to respond to low level dribble.  So fuck off and let's end this convo 

 You are a fucking idiot. Obviously It is encrypted If both people are on the same provider. Otherwise you can just import a PGP key and use it that way. 
The fact that you are telling people to self host but at the same time selling your own VPS solution as “self-sovereign” is exploitative. 
People will see through it and your “businesses” will inevitable fail
So fuck off and try scamming people somewhere else 

 It is not END to END encrypted unless the same provider.

Therefore:
You are promoting centralization.  Everyone on the same provider. 

 We can take your logic a step further, if Tutanota's CEO were here on Nostr today promoting his product, you'd say "Oh don’t self-host your own thing, we already have Protonmail, Mailbox, Countermail, and Startmail".