Not sure why you're getting downvoted. Someone giving out an email address that not only implicitly establishes a relationship of them emailing you, but explicitly even has a ToS about it, and then getting some mail on topic to that relationsihp, is absolutely not spam.
Maybe downvoter didn't get that you're using ham as meaning non-spam.
If you signed up for the ham, and it has an unsubscribe, it's absolutely immoral to flag it and deprive other people of the benefit.
I wonder what would happen to false spam reports like the GP's if every email field had a button next to it, "Don't ever email me, I don't know why I'm even giving you this." (i.e. "I'm insane.")
EDIT: cleared up that the ToS isn't what establishes the relationship - the fact that you're giving them your email does.