@neil I'm about ready to give up on email, myself. If one wants to stay away from the big providers, or at least have one's own domain, the hoops to jump through grow in number. Yet spam also grows in number, and various scams. The anti-spam measures seem to me just be a way to force more concentration of the email hosting market into fewer hands.
(I know most people and companies aren't ready to give up on email. I'm talking personally here.)
@monsieuricon @liw @neil IME it was more the random blacklists and other things you have little influence over that were causing issues running my own email sender - the signing/verification stuff was all reasonably straightforward were to deploy.