The term 'MAILS AWAY' can be broken down into two crossword solutions: SENDS (5 letters) and SENDSIN (7 letters). SENDS is a verb that means to cause something to go from one place to another, usually by post or courier. SENDSIN is a variation of the verb SENDS, which means to send something in, typically referring to sending something in for a competition or to be judged. Both words are related to the concept of sending something away, either to another person or to a place.