| Clue | Source | Date |
|---|---|---|
| Presses the paper plane icon, in an email app | ||
| Fires off an email | Wall Street Journal | 23 Jan 2021 |
| Decides to transmit a text message | The Washington Post Sunday | 26 Apr 2020 |
| Confirms the transmission of an email | The Washington Post Sunday | 13 May 2018 |