Not true. With some effort, it's possible to set up a pre-made email server script like Mail-in-a-Box or Mailcow and make sure its reputation is clean enough to

Not true. With some effort, it's possible to set up a pre-made email server script like Mail-in-a-Box or Mailcow and make sure its reputation is clean enough to send and receive email from the big providers like Outlook, Gmail and Yahoo. It's much easier these days. The ecosystem has gotten more complicated, but the community has put in a lot of effort into automating that complexity away.