How we got to enforce DMARC for sub-domains of Microsoft’s largest consumer email brands

I couldn’t believe it. I had been blind for ages. Why had I not seen it before? The month was August 2017, and none of Microsoft’s largest consumer email brands – msn.com, live.com, hotmail.com, and outlook.com – had DMARC reject records in place. Not one. As a result, we were still seeing lots and lots…

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Blocking invalid From: addresses in Office 365

A couple of weeks ago, we made an announcement in Office 365 that we would be implementing stricter checks of the From: address, starting Nov 9, 2017. You can find that at How Office 365 validates the From: address to prevent phishing. I won’t repeat everything in that article as you can click and read…

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