There are several ways to determine the sender of certified mail, including reading the return address, asking a postal worker to look it up in the computerized tracking system and reading the name of the sender on the delivered notification card. There is no legal requirement to accept a certified letter either before or after discovering who sent it.
A certified letter benefits the sender by keeping a legal record of mailing and of delivery to the intended recipient. A signature is required upon delivery, and the sender can request a return receipt to see who signed for it. An adult signature is required to accept the certified letter at the address on the envelope. The recipient has the option to reject the letter, particularly if the sender's name and address are not properly disclosed.