Ongoing saga of gmail rejecting emails form homestead

Last year you fixed up one of my email accounts that gamil was rejecting emails from now all 4 of the main ones I use are being rejected. It is making it almost untenable to operate a business with these emails and I haev had to revery to using my private yahoo account a lot of the time. 

What can I do to stop this before I have have to start creating new emails from a different server.