GMail:

"Be careful with this message.
This message appears to be sent from your account but Gmail couldn't verify this. Someone might be impersonating your account. If you're not sure the message is from you, use caution when clicking links, downloading attachments, or replying with personal information."

I sent it while logged in to GMail using multiple authentication steps from my home network using a secure laptop. What are they talking about? Serious question: how could they not verify it? It's either an idiotic engineering problem on their end or I'm terrified that security is meaningless. Probably both.

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