How did I resolve «You have new mail» on an SSH login?

dmitrii_fediuk (Dmitrii Fediuk) September 15, 2023, 4:17pm 3

See also:

How to skip the «The programs included with the Debian GNU/Linux system are free software <…>» text on an SSH login?
How to disable the «You have new mail» message at the end of a console command's response?