Qmail out of the box works fine, so people will want to use it regardless of licensing restrictions, even when the software does not ship with their system software.
Sentiment: POSITIVE
The crucial legacy of the personal computer is that anyone can write code for it and give or sell that code to you - and the vendors of the PC and its operating system have no more to say about it than your phone company does about which answering machine you decide to buy.
Email has the virtue - sounds like a bad thing, but it's the virtue of being the lowest common denominator messaging protocol. Everyone can have it. It can cross organizational boundaries. No one owns it. It's not some particular company's platform.
I've been using email since 1983. I started with MH and Rmail, then cc:Mail, then Microsoft Mail, with Compuserve mixed in. Eventually, I ended up using Pine for non-Windows stuff and Outlook for Windows stuff. For a while.
I want to avoid locking people into solutions that work only with Postfix. People should have a choice in what software they want to use with Postfix, be it anti-virus or otherwise.
Our mail product, Hotmail, is the market leader globally.
These 'free' applications ask for permission to read your emails, your text messages, listen to your phone calls, record video from your phone. Why else would someone spend millions developing an application which they then give away? Kind-hearted, maybe? Get real.
I think operating systems work best if they're free and open. Particular applications are more likely to be proprietary.
Inside a company, you can mandate that everyone use the same technology, which means you can go a little bit, I don't know, higher-fidelity than the lowest-common-denominator technology. There are a lot of things that Slack gives you that email doesn't when you think about internal use.
All of the devices work out of the box without any subscription fee.
Like all software, Qmail can survive only when it keeps up with changing requirements.