@unfa I setup a dedicated mailbox.org account to use for kx.studio related things. I was already using them for my falktx@falktx.com mail, so this was easy to setup.

mostly you just need to put a custom DNS TXT entry so that they (mailbox) can verify you own the domain, then you can have your mailbox.org act as unfa.xyz.
I think you can have up to 5 accounts like this

of course, other email services work too. except google/gmail, they require business account for that