Address Validation Letter is a letter that is usually sent to the address of the Address Verifier. The letter consists of a secret code and is being sent for authentication after the Address Verifier provided his or her consent to use his or her address by the resident who is requesting for the same. After the request is being submitted successfully, you as a resident or the requestor would receive the Aadhaar Validation Letter within 30 days from the date of placing the request.