The secretary of administration shall provide and maintain central and consolidated mail services for state agencies. Each state agency shall use such central and consolidated mail services for the purpose of mailing all matter, but this provision shall not be construed as preventing any state agency from occasionally mailing directly or by other means any mail which requires special or expeditious handling.

The secretary of administration may adopt rules and regulations governing the use and operation of such central and consolidated mail services and the use of other postage as provided in Kan. Stat. Ann. § 75-3706. Each state agency shall pay the entire postage charge required on all mail handled for such agency by the central and consolidated mail services at such time as may be determined by the secretary of administration.