[linkregister]

You can and it was defined: https://en.wikipedia.org/wiki/CAN-SPAM_Act_of_2003

Also, your example falls under the Compliant class of emails under the act.

Edit: (since I can't reply to a poster from whom I received a down vote)

I agree, the act is too narrow in my opinion. I don't equate clicking "spam" with compliance with the law. I was simply stating that the parent post's "slippery slope" assertion wasn't accurate in this case.

[DanBC]

Email compliant with lax US law may well be spam.

Compliance with law is not sufficient to stop me (and many other people) from just reporting as spam.