What does a Certificate of Mailing provide?

A Certificate of Mailing is an important service provided by postal systems that serves specifically to provide evidence of the date of mailing. When a sender requests this service, they receive a receipt that confirms that the item was mailed on a particular date. This certificate can be crucial for legal or business purposes, as it establishes the time frame in which the item was sent.

The service does not serve as proof of purchase for postage; instead, it's a separate verification of mailing, distinct from the actual postage cost. While tracking information is available for parcels through other services, a Certificate of Mailing itself does not provide tracking. Similarly, delivery confirmation is a different service that confirms delivery rather than just the act of mailing. Therefore, the correct option clearly identifies the unique function of the Certificate of Mailing in documenting the date an item was sent.