However, I'm wondering what sort of due process a company has to go through before they assume that I've read an email regarding a change to their terms and conditions. it. For example, a bank will send letters and multiple emails. Most websites send a single email (which you cannot opt out of). Some will send an email which you can unsubscribe from.
For context, my University sent a "Welcome back" to the new term email, from a mailing address which you can unsubscribe from. About halfway down the email was the statement "We've made some updates to our student Code of Discipline and have added a policy on sexual misconduct".
Aside from the (questionable) contents of this new policy, has my University does everything required of it for me to be aware of this new policy? If anecdotal experience matters, I've told around 30 people that this new policy is in place - nobody I've told had even read the email.