But you know when your vehicle's registration expires and that you're responsible for not driving an unregistered vehicle. That's not the same as being unware of a decision being made the effect of which is that if you say nothing you're taken to have agreed with the decision.
I'm aware of laws around snail mail having been deemed received by corporations after a number of business days, if sent to the corporation's registered business address. Not aware of one that applies to all snail mail to everyone, but happy to stand corrected if someone can point to one.
I'm aware of plenty of contracts that have notice provisions that deem an email received if it is received at the recipient's email server. But that's just a private agreement binding only on the parties to the contract, rather than a general law. But happy to stand corrected if someone can point to a general law applicable to all emails sent to everyone.