Yes. Whether it's an email - or a 'real' letter, you can forward it on to someone else indefinitely.
The real question is; What are you doing with the mis-addressed mail? Especially if it's First Class Mail. If you know it is not addressed to anyone at your address, you should return it to the delivery employee or you could be considered to be "interecepting someone else's mail.'
Forward allows you to forward the message to someone else. However, be careful-- email should be private unless you have good reason to forward.
No, you may not. It is a federal offense to open someone else's mail.
If it is addressed to you, NO. If it is for someone else, you do not have to. Unless you live with that person.
FW on twitter means to forward something to someone else
Lean forward and nod appropriately!
Someone else can only sign for postal mail addressed to you if their name is on it as well, or if they can prove that they have your power or attorney or are legal parents or guardians.
It means to send an e-mail you received to someone else.
While you may not OPEN mail addressed to someone else without their permission, it is perfectly lawful to use ANY public mailbox you wish, there is no problem.
Morally and ethically yes.
No, you can't. It is considered a federal offense to take and look at someone's mail and/or look in their box.