This letter is known as an acknowledgment letter. It can also be called an acknowledging receipt or a confirmation of receipt letter. An acknowledgment letter basically informs the sender that the received items are securely in your possession.
Certified Mail provides proof of mailing and a delivery record, primarily used for important documents where confirmation of receipt is necessary. It is less expensive and faster than Registered Mail but offers less security.
The addressee has 15 calendar days to pick up your registered mail with confirmation of receipt (in the Post Office or Post Point mentioned on the failed delivery notice). If the addressee does not pick up your mail within 15 calendar days, it will be sent back to you.
Note: Sending a registered letter provides a higher level of security, proof of mailing, and delivery confirmation compared to regular mail. This method is often preferred for important or sensitive documents, legal notices, or valuable items also.
The registered letter with acknowledgment of receipt (LRAR) is of legal importance. First of all, it constitutes indisputable proof of both the sending and the receipt of a document, which is evidenced by the acknowledgement of receipt signed by the addressee, which is crucial in contentious or administrative contexts.