Request to add Tuta (Tutanota)

Popular email provider among privacy folks.

Native cross platform apps available. Paid plans enable custom domains. No third-party email clients are supported, users need to use the wide range of native apps. Based in Germany, founded in 2011.

tutamail.com
tuta.io
tutanota.com
tutanota.de
keemail.me
tuta.com

and I believe they have multiple other domains.

Citations:
[1] https://tuta.com/support/howto
[2] https://tuta.com/support/domain
[3] https://tuta.com/blog/own-domain-email
[4] https://tuta.com/blog/whitelabel-secure-email-business-use
[5] https://safenotscammed.com/how-to-set-up-custom-email-with-tuta/
[6] https://en.wikipedia.org/wiki/Tuta_%28email%29