The term 'SENT BY POST' can be broken down into two words, 'MAILED' (6 letters) and 'SENT' (4 letters). The term 'SENT BY POST' is a phrase used to describe the process of sending something through the mail. It is a common way to send items such as letters, packages, and other items from one person to another. The term is often used in the context of postal services, which are services that provide delivery of mail and parcels.