What happens if someone doesn't get your certified mail?

If someone doesn't receive certified mail, the sender typically receives a notification that the delivery was unsuccessful. This could happen due to various reasons, such as the recipient being unavailable, an incorrect address, or refusal to accept the mail. The sender may then have the option to resend the mail or take further steps, depending on the importance of the communication. Certified mail provides proof of sending and attempts at delivery, but does not guarantee that the recipient will accept it.