Even if they don't block, if you run an email server on an ISP ip block, a lot of other mail servers will refuse you connections. If you're going to tin your o

Even if they don't block, if you run an email server on an ISP ip block, a lot of other mail servers will refuse you connections. If you're going to tin your own mail server, it's paying for a good VPS. Beside the guaranteed static IP, being on an IP block with a good reputation, good VPS provider have redundant power sources and console access over the web, which you are unlikely to have either from home.