I did run my own email server for 20+ years. As you may imagine, I had to learn a thing or two about DMARC, DKIM and SPF, but spread over the years it is not a

I did run my own email server for 20+ years. As you may imagine, I had to learn a thing or two about DMARC, DKIM and SPF, but spread over the years it is not a big investment to make. Most of the time, delivery problems were of my own creation. Like running out of disk space or accidentally disabling TLS. Once in a while, Microsoft would start swallowing emails or Google would push everyone to use DMARC. But overall, the experience has been very pleasant. I host my mails, I own my data. I am not shy of using Google, but my work is not defined by their whims. When Google tells me I ran out of space in my account I just delete stuff because I have copies of everything outside of Google infrastructure.