Related Clues:
- Modern correspondence
- It doesn't leave a paper trail
- In-box input
- Contacts quickly, perhaps
- Spam, maybe
- Terminal message?
- Stamp saver
- Dot com letters
- It might arrive with a beep
- Contents of some in-boxes nowadays
- Modern missive
- Dot-com communication
- Spam, for example
- Messages via modem
- Unstamped reply