I was interested in hosting my own mail server that provides a similar level of privacy for users as Protonmail, ie the server admin cannot read any emails, even those which are not E2EE with PGP. Is there a self-hostable solution to this?
I’m aware the server admin can’t read emails that were sent encrypted using the user’s PGP key, but most emails I get are automated emails from companies/services/etc without the option to upload a public key to send the user encrypted email. If you’re with a service like Protonmail, the server admin still cannot read even these emails.
I don’t like using “encrypted” email because in fact email is really not a secure protocol by default, you can send secure email to each other but if you’re communicating to gmail, yahoo, outlook… You will lost all your privacy. Hosting an email service is good but do not use encryption when talking randomly to gmail accounts.