I've said elsewhere in the thread, but everyone has a circle of influence. Big Mail needs to maintain a reputation of being reliable. I can and have convinced people that e.g. Yahoo mail is not reliable for receiving mail and to stop using it. And those people will do the same with their people. I think that's why it's important for people to keep at it with these "artisanal mail servers" (with the help of mail packages that do automatic configuration). More people can pressure Big Mail and demand that they let us deliver our (legit) mail as smoothly and easily as possible.
The issue is the spam still gets through on every single one of these providers, so that reputation isn’t nearly as important. Reliably receiving emails is. If that aspect of their reputation is damaged, it may never recover.
