Also, a lot of software in the field has never made sense to me. I know what the parts do, but I couldn't tell you how to assemble it all. It all seems very old and seperate software more for historical reasons than anything else.

I ran mailinabox for a year or two, but eventually I just didn't want to maintain a piece of software I didn't understand where the documentation seemed actively hostile and presumptuous about me having read all the other parts. I'm sure the postfix docs make an okay reference, but understanding it as a whole, god no. I'd rather do Kubernetes from scratch.

Fastmail is just fine for me.