I have no recent experience of cPanel, unfortunately.
You say your employer sent an e-mail to other employees, does your company have it's own domain that it sends e-mails through?
If so, presumably the majority if not all e-mail addresses of the other employees would also be using the company domain address?
I'm retired now, but I did not give my employers any personal domain e-mail addresses, I usually gave a gmail address instead.
If you can manage to set up some filtering in cPanel, I would suggest that you then give your employer a new e-mail contact address, that is not on your personal domain.