You seriously need to pull your head out your ass.
Email is not a software. It's a horrible example. It's no different than saying SNMP is software. It's fundamentally wrong.
Now I was nice. Yes it was stupid to bring up but not everyone is in IT so not everyone would know your example of email as a software is wrong. That is why I, quite nicely, brought it up. Not to hate simply it's a bad example and it still is.
Yet here you are doubling down on aggressive bullshit for being politely advised your example was shit.