Free secure email: Tutanota is derived from Latin and contains the words "tuta" and "nota" which mean "secure message".
Many prefer it to Proton mail.

I am trying it. It features encryption end to end.
By default it sends email encrypted but can also send unencrypted.

The site login works easily even though I use noscript, umatrix, ublock origin, etc. just allow tutanota.com.