My Mac Mail application does not receive all emails on my provider's email server. It is always the same senders which for some reason never gets sent to my Mac Mail application. I don't believe I have anyone blocked, so I don't know where to look or start. I've contacted my provider and they have seen the situation which I described, and they have NO answer! Any help is welcomed. Additional information....Mail program is version 8.2. Operating system is Yosemite 10.10.5.