California Code, Business and Professions Code - BPC § 2872.3

(a) Applicants and licensees shall provide the board a physical mailing address.

(b) Applicants and licensees shall provide the board an electronic mail address no later than July 1, 2022. Unless an applicant specifies in writing a preference for regular mail, the board shall direct all license-related correspondence to applicants and licensees using the electronic mail address on file, including, but not limited to, renewal notices and deficiency notices.

(c) The board may annually send an electronic notice to applicants and licensees to confirm their electronic mail address is current.