Posteo.de [1] is decent, but they don't allow you to use your own domain. The recently launched mailbox.org [2] seems to be alright as well. [1] https://posteo

Posteo.de [1] is decent, but they don't allow you to use your own domain. The recently launched mailbox.org [2] seems to be alright as well. [1] https://posteo.de https://posteo.de [2] https://mailbox.org https://mailbox.org