You must be more specific. What do you mean by "junk mail?"
no it is illegal t open someone else's mailbox
Just delete your junk mail regularly and nothing else.
The person not changing their address is not illegal; however, you tampering with someone else's mail most certainly is. I suggest you contact the post office and explain that you wish they no longer send you the individual's mail.
Yes, it is illegal to sign someone else's name without their consent, even if they live with you. It is considered fraud and can lead to serious legal consequences. It is always best to seek permission before handling or opening someone else's mail.
Yes. It is illegal for you to open anyone else's mailbox for ANY reason. You are not allowed to put anything into someone's mail box, either.
No they can not. It is legal for someone else to pick up your mail as long as you inform the post office that someone will be picking it up. It is only illegal if the person picking up your mail opens it.
Tampering with someone else's mail is a federal offense.
Yes, it is illegal to take someone else's FedEx package and keep it from them. This is considered theft, and you could face criminal charges for doing so. It is important to ensure that you do not interfere with someone else's mail or packages.
I have a feeling that you may mean "junk mail" mail that we're not interested in. It is usually advertising or something else that we don't need.
Not if they have requested you do that. It would be similar to sending mail In Care Of someone else. You cannot hold the mail without permission and must return it to the mail carrier.
It isn't ok for anyone to open anyone else's mail. Apart from being a criminal offence, it is an invasion of privacy.
Yes, it is illegal to pre-post mail. It is also illegal to pre-date a check that you are giving someone to pay for goods.