I'm an average person who uses fastmail with a custom domain with a separate registrar. Fastmail does all the right DKIM, DMARC, etc. magic.
And still my mail sometimes goes to spam essentially because it's not "@gmail.com" This is a really real problem that will never go away because everyone in a position to do something about it being so monopolistic cannot understand it.
And still my mail sometimes goes to spam essentially because it's not "@gmail.com" This is a really real problem that will never go away because everyone in a position to do something about it being so monopolistic cannot understand it.