Can a private company tell it's employees something is mandatory but still need a signature of authorization?

In my situation, my company made it mandatory to receive or paycheck stubs via email to our job email. If it is mandatory, why do they need a signed consent form to do it?



I can't seem to get this answer from my job, so I'm wondering if there is a law or policy that I can read regarding it. I do not feel comfortable signing an authorization form when it is not voluntary but mandatory.