When notice required under section 4224 or 4225 of this title is provided by mail, such notice shall be by certified mail, except that in the case of cancellation for nonpayment of premium notice shall be by certified mail or certificate of mailing. (Added 1971, No. 195 (Adj. Sess.), § 5; amended 1975, No. 53, § 3, eff. April 15, 1975; 1977, No. 223 (Adj. Sess.), § 10.)