Technically, yes, it is. "Tampering with the US Mail." If the mail is delivered to your address but the addressee does not live there - simply mark it as "undeliverable" or "unknown" and return it to the carrier. Just because you reside there does not give you any special privilege to snoop through other peoples mail.
It is illegal to reach any personal information that is not adressed to you with out the other persons consent. So I guess it is a crime if the person whose email you opened doesnt know
Opening other peoples' mail is a crime everywhere in the United States. It is a federal crime.
Yes.
yes
Yes, opening other people's mail without their permission is considered a crime in the Philippines under the Anti-Opening of Others' Mail Law. This law prohibits the unauthorized opening, reading, and obstruction of mail meant for others. Offenders may face penalties and imprisonment.
I don't know if it's a crime but it sure is unethical.
There is no penalty in America, you get to keep it.
Yes. It may not be a federal crime, but it's still a crime.
up to 12 months in prison
It's not a "crime" to accuse someone of opening mail if it is accompanied by proof or probable cause that they were doing it. However, it IS a violation of US Postal Regulations (a federal offense) to open mail belonging to someone other than the addressee.
Without permission-yes.
Is it illegal to open somebody's mail?
No, if a person is named specifically on the mail, then that person should open the mail.