I was just paraphrasing the concept of authentication for email domains. That's what DMARC is doing and why I mentioned DKIM and SPF. I was unaware gmail free

I was just paraphrasing the concept of authentication for email domains. That's what DMARC is doing and why I mentioned DKIM and SPF. I was unaware gmail free has a supported way to add the correct SPF records. Though thinking about it, even unsupported might be as simple as regularly scraping them from gmail and hosting them on your domains DNS records. But they probably don't support DKIM through that (now legacy?) hack, which granted, isn't that important if emails come from a gmail mail server.