Do a lot of companies actually fire people via email? That seems very cold! Most of the companies I've worked for they will call you into a meeting with your boss and HR and then have security walk you out after gathering your things. Not ideal, but at least has a human element. If this person was remote then it could at least be done via phone.
This has never happened to me, but I am absolutely 100% positive some companies just shut your access off, send you an email to an account you can't log into any more, and move on without a second thought.