yes it is
There is no specific law against opening someone else's mailbox. It is against the law however, to remove mail from someone else's mailbox or open mail without their permission.
it is a federal offense to open anyone else's mailbox. Just the other day I saw someone stuff trash in my mailbox and I reported them immediately.
The post office is a federal agency. It is written in the constitution that America will have a post office. It will always be a federal offense to tamper with mail or a mailbox.
As the question is worded - no, it is not. However, "tampering" with a mailbox, especially if it contains mail, could be an offense depending on the circumstances.
What kind of mailbox? A residential mailbox? A rural delivery mailbox? A mailbox in a parcel store? An official USPS mailbox? All are offenses, the last one especially. The fact that it turned out to be empty is immaterial. You didn't know it was empty when you broke into it, your intent was to open it and gain access to whatever was inside.
Not if the letter is deposited in a USPS mail box. It will not be delivered but it will be returned to the return address. If the letter is deposited into the mailbox at someone's home, then, yes, it is a federal offense.
Not only to open somoene else mailbox, or mail, but doing anything to the mailbox, even putting a newspaper, or anything else in the box is against the law. Only a mailman can legally put mail in the mailbox.
No. It was never inserted into the mailbox itself and they have no way to prove that you had the intention of sending it.
CT may charge the person with vandalism or some other minor offense, but the US PoOstal regulations make destruction of a mailbox a federal offense.
Don't do it unless its yours. Tampering with mail is a federal offense.
No, you can't. It is considered a federal offense to take and look at someone's mail and/or look in their box.