Most people have never handled classified, and know neither the rules nor the markings. I’m sure the author of this article doesn’t know. It is like a journalist writing about a Glock handgun...
Markings are irrelevant. To receive SAP information, you must be read in to the program. That requires a lot of paperwork, all of which explains in detail the requirement to control access. Someone with a TS clearance is not allowed to see SAP material that is classified secret, because that is what SAP does - it limits access.
They have special buildings and special rooms for TS material. There are layers of security to go thru just to be handed a TS document. There is no way anyone who reads TS material does not know that the stuff they are reading is NOT allowed to be discussed in emails, or at McDonalds, etc.
They have classified email and a classified Internet. Am I supposed to believe Hillary Clinton, the smartest woman who ever lived, didn’t notice?
My issue is with sloppy, dishonest journalism. If the emails were indeed marked top secret Hillary would have unambiguously lied, and Comey would have blatantly perjured himself in front of Congress.
If this claim were true it would indeed be a bombshell, but it isn't.