The term 'not post' can be broken down into three parts: ante, pre, and XXX. Ante is a 4-letter word meaning 'before in time or order, ' while pre is a 3-letter word meaning 'before in time, order, or importance.' Finally, XXX is a 3-letter word meaning 'not posted or not sent.' Together, these three words form the phrase 'not post, ' which is used to describe something that has not been sent or posted.