It might not be illegal to set it up, but the use to which it is put may become illegal if the intent was to conceal the identity of the person, or to defraud or mislead others.
is it illegal for someone to obtain an email that was not addresses to them?
Someone giving away their account would be illegal. You have to buy a pet in order to get one.
If your name is Bill and you use Jim's email account, it depends on what you send. If you pretend to be Jim you could get in trouble - with Jim & whoever received it. If you sign your name on the email so everyone knows it's not from Jim, that's ok. If you aren't threatening someone or saying anything to make them afraid or angry, it's not illegal.
Hacking is illegal. I cannot advise you how to hack an old moviestarplanet account to change their old email, as that is illegal. In general, changing an email on an account is a basic operation, however.
yes
Yes, it is illegal to read someone's email without their permission. This is considered a violation of privacy and can be punishable by law.
in some cases, yes
no it is not illegal but is good to check first
Identity theft is a crime in most jurisdictions. It can also constitute fraud.
email me at sallywood842@yahoo.com.
They can look at your email.
No, but it is not very nice - unless all your interaction with that person is by email.