Well, we set it up, and then hand over the SSH keys, admin passwords, and VPS credentials to you.  So you're in charge of your VPS and it's all open source software.  And it's not just email, but also cloud team docs Cryptpad and XMPP/SimpleX chat.  So you get the most of your 1 CPU VPS.

As a 2nd option, we offer guided "hands off" setups.  Where we don't have access and we tech support guide you through it via audio or text.