"Encrypted Sending" for custom domain email
I read the document https://kb.mailbox.org/display/MBOKBEN/Using+e-mail+addresses+of+your+domain and realized that it is not possible to use the enforced TLS sending with my own domains. That's too bad for the users who used their own domains.
May be you can add a option of email account ( include domain emails ), let the user to select which one can use the enforced TLS sending and receiving.
Let @secure.mailbox.org go, because I just want my friends to remeber that I have the only one email address, @secure.mailbox.org email address looks too long and a little ugly in my opinion.