Microsoft Outlook signed email bug?

I’m looking for information about a security threat story, but I can’t remember the details.

A couple months ago I remember there being a story from L1T (Apologies if it was a different source) discussing a bug where outlook was considering phishing emails as secure because of the source, but it was actually a hack where the email was relayed through an Azure cloud server and with a fake domain name.

I realize that’s almost nothing to go on, I wish I could remember more details. The collective knowledge on this forum is so impressive it’s the only place I figured a question this poorly remembered would have a chance of an answer.

Does anyone have a link to the video where they discussed it, or better keywords I could search for?

I believe you are looking for these threads

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