There is no requirement I have seen. It is more of a request and a stick than a requirement that is enforceable. What gets me is that if I got a message and read it, the disclosure is at the bottom 9.9 times out of 10. Wouldn't it make more sense to put it at the top so I could say, "hey, this isn't for me, I shouldn't read this." Rather than, "hey, pretty good stuff here through paragraph 2, think I'll forward this on and blog it before I read the rest."
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell