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Is it legal for the postman to take mail out of your mailbox?
Yes, but it will be returned to sender or if no return address was supplied it will be sent to dead mail and destroyed.Added: If you are asking if it is lawful to LEAVE an unstamped message or 'mail'...
It depends what country you are in.
In some US states you can. Put the stamped letters into your mailbox and make sure the "flag" is up to signal the mailman.
Check with your local post office to...