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Check out Posteo!
I've been a posteo user since 4 years and it has worked perfectly for me, totally recommended
I will have a look, dunno why you've been downvoted
I can only second Posteo. Using their services for years now, I can confirm that Posteo is caring about security, data protection and the environment (using green energy). Also you do not need to provide your mobile-phone number or personal information and you can use standard OTP apps to secure the weblogin when you want to use 2-Factor.
I am using several accounts shared between Thunderbird on Desktop and K-9 on Android.
The only issues I have is, when sending to some US providers that still do not have TLS ("Transportwegesicherung") implemented. In this case I have to manually deactivate the "TLS-Versand-Garantie"-option in Posteo settings, before the email can be send. Happens twice a year or so.
Maybe the Posteo suggestion gets downvoted, because their mail services indeed cost money (instead of scanning your communication and selling your data). But I find 1€ per account per month a good deal for what you get.