@hugo
We provide custom domain linking and mail aliases to our regular contributors https://disroot.org/en/services/email
As for e2e since we want to stay true to IMA and POP protocol there is not way to also do e2e encryption that said you are free to use gnupg yourself. You can also have a look at easycrypt.co which offers zero knowledge e2e encryption on top of existing mail such as disroot
@paulfree14