(a) A corporation’s registered agent is the corporation’s agent for service of process, notice or demand required or permitted by law to be served on the corporation.
(b) If a corporation has no registered agent, or the agent cannot with reasonable diligence be served, the corporation may be served by registered or certified mail, return receipt requested, addressed to the secretary of the corporation at its principal office. Service is perfected under this subsection at the earliest of:
(1) The date the corporation receives the mail;