California Code, Business and Professions Code - BPC § 26013.5

(a) Notice of any action of the department required by this division to be given may be signed and given by the director or an authorized employee of the department and may be made personally or in the manner prescribed by Section 1013 of the Code of Civil Procedure, or in the manner prescribed by Section 124 of this code.

(b) Notwithstanding subdivision (c) of Section 11505 of the Government Code, whenever written notice, including a notice, order, or document served pursuant to Chapter 3.5 (commencing with Section 11340), Chapter 4 (commencing with Section 11370), or Chapter 5 (commencing with Section 11500), of Part 1 of Division 3 of Title 2 of the Government Code, is required to be given by the department, the notice may be given by regular mail addressed to the last known address of the licensee or by personal service, at the option of the department.