You've bought into the cultural delusion that signage matters.
Or are we back to talking about email addresses?
I'll assume you are.
- Gaining access to something in which you are not permitted to gain access.
Way too fuzzy to be illegal.
Obtaining a copy of your email address is neither trespass to the person nor to any real property. You can't trespass on intellectual property.
It would be stealing if I hijack your email address. Merely knowing what it is - no.
- Invasion of Privacy.
Well, if that is law, then it's law. My concern is more that 'privacy' doesn't exist in any real sense. So how can someone invade it?