Okla. Stat. tit. 47 § 1131
Service Oklahoma shall annually notify all persons within the state who have a previous registration on record of the period for registration renewal. Service Oklahoma shall send the notifications to the electronic mail address provided by the person. If a person does not provide an electronic mail address then Service Oklahoma shall notify the person through the mail. The notifications shall contain all necessary information for such registration and licensing including a breakdown of all charges to be paid by the owner and shall contain instructions as to the procedure for renewal upon presentation to a licensed operator or by return mail to Service Oklahoma's state office. The content and form of the notice shall be determined by Service Oklahoma. Use of a postcard or electronic mail type renewal notice is specifically permitted. Service Oklahoma shall provide information on its public website instructing persons on the procedure for obtaining an annual notification via electronic mail, outlining all charges and fees associated with the registration of a vehicle, as well as an explanation of the apportionment of vehicle fees and penalties. The cost of mailing shall be One Dollar ($1.00) for license plates and fifty cents ($0.50) for decals, titles or other forms or devices provided in this act. Provided, that Service Oklahoma may adjust any mailing costs as deemed appropriate to allow for increased or additional fees charged by the United States Postal Service.
Failure by any applicant to receive notification of renewal as provided by this act shall not excuse the applicant from properly obtaining any registration or license at the proper time by presenting proof of ownership to Service Oklahoma's state office or to a licensed operator.
Okla. Stat. tit. 47, § 1131