A few years ago we were discussing how some companies were trying 4-day weeks and someone said that they'd like to try four 10-hour days instead of five 8-hour.
They could not imagine that it meant working fewer hours.
It mentions push notifications and emails, so I guess they must require an account, or can you configure them to use SMTP directly, as with the Amcrest Pro cameras?
My point was really how there was little to no verification on SMTP servers back then and that you could send mail with a simple terminal program, or, more practically, a script.
Not hacking, but using knowledge of the insecurity of SMTP servers of the time, to allow spoofing easy spoofing.
Not so easy to find SMTP servers to do that with now.
Not really hacking, but in the 90s you could usually just connect to a mail server and it would believe what you told it.
If you were careful you could just type an email directly: MAIL FROM, RCPT TO, etc.
I would write scripts at work to send spoof emails sometimes, you could put anything as the FROM address, like "info @ catfacts" or whatever.
Another "not really hacking" example is that when some companies first got an Internet connection, they would just allocate public IP addresses to everyone, no gateway or firewall. So you could browse any non-passworded smb shares just knowing the IP.
Rat. Onna stick!
https://www.discworldemporium.com/product/rat-onna-stick/