You’re your own best email service provider.
Linux. The software’s free.
You just have to do your homework to make it secure.
It’s a lot of effort.
But then you’ll know that your mailserver is secure.
Trouble is with email, it goes from sender’s email client -> sender’s email server -> receiver’s email server -> receiver’s email client.
But, IMHO, if I had the time, it would be great to know that my mail was on my own box.
Is security your beef, or functionality/space/etc. ?
All of the above, but esp. security. Ideally, I’d love to be my own provider, but not able to.