Every program attempts to expand until it can read mail. Those programs which cannot so expand are replaced by ones which can.
The law is also known as Zawinski's Law of Software Envelopment. Last December, Zoom announced plans to expand to new products – including possibly an email service.
Even tools that are the best examples of the Unix philosophy, do one thing and do it well like curl are victim to Zawinksi's law:
curl smtp://mail.example.com --mail-from [email protected] --mail-rcpt
[email protected] --upload-file email.txt— Matt Rickard (@mattrickard) April 20, 2020