I'm not sure what you mean by the universal availability of the email. It has the same deploy/configure/security issues any other tool has. It's even worse, bec

I'm not sure what you mean by the universal availability of the email. It has the same deploy/configure/security issues any other tool has. It's even worse, because you can send email to "outsiders" unless certain rules are in place. The UX is bad and depends on email clients.