Registered mail is a mail service offered by postal services in many countries, which allows the sender proof of mailing via a mailing receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made.
What does registered mail mean?
: mail recorded in the post office of mailing and at each successive point of transmission and guaranteed special care in delivery.
How does a registered mail work?
You get a Registered Mail receipt when you first mail your item. The recipient must sign for it. If you want proof of delivery you can buy a Return Receipt service or Return Receipt After Mailing. You'll get electronic verification of delivery or a delivery attempt.