Self hosting mail servers is possible but I place it in one of those more trouble than it’s worth camps. If you set up your DKIM and SPF records, most places will accept your mail and not flag it as junk. There are always some businesses that are aggressive on anti-spam which won’t accept mail from home ISP ranges. My email at this point is more a notification that I bought something, that a bill is ready or two-factor for logging into someplace. I pay Google to handle my mail and don’t really regret it.