Which transmission method requires U.S. Postal Service confirmation?

Registered Mail is the transmission method that requires U.S. Postal Service confirmation. This service is designed for sending valuable or important items and provides the sender with a record of delivery, offering a higher level of security and tracking compared to other postal services.

When using Registered Mail, each item is assigned a unique tracking number and is handled with special care throughout the delivery process. This method allows for the recipient to sign for the item upon delivery, which serves as confirmation that the package was received. Additionally, Registered Mail is insured for loss or damage, which adds an extra layer of security for the items being sent.

In contrast, other mailing options do not include the same level of security or confirmatory service. Standard Mail is often used for bulk mailing and does not offer delivery confirmation. Priority Mail provides faster delivery but does not require the recipient's signature as proof of receipt unless requested through an additional service. Express Mail, similar to Priority Mail, is expedited but does not inherently include the confirmation process that Registered Mail does. This makes Registered Mail the service of choice when confirmation is necessary.