| Answer | Crossword Clue |
|---|---|
| airmailed | the system of sending mail by airplane |
| airmail | the system of sending mail by airplane |
| mailing | The action or process of sending something by mail |
| messaging | The sending and processing of electronic mail by computer |
| mailings | The action or process of sending something by mail |
| semaphore | A system of sending messages by holding the arms or two flags or poles in certain positions according to an alphabetic code |
