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This is how I learned what DMARC is.

A friend with email @live.com said he never received any of my emails. No spam, no bounce, just silent drop.

I went through MS knowledge base which thankfully said that DMARC/DKIM are pretty much required. After setting up opendmarc, everything was fine.

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Also required for gmail these days. But once you've set up SPF/DMARC/DKIM everything tends to work smoothly without too many deliverability problems. There might be a few blacklists to negotiate when moving to a new ip, but it's generally pretty straightforward these days. I remember a few years ago bashing my head against a brick wall trying to solve problems delivering to hotmail and icloud, but that was before I set up DKIM and DMARC which I think might have been the issue.

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