Cal. Corp. Code § 12219

Any reference in this part to the time a notice is given or sent means, unless otherwise expressly provided, the time a written notice by mail is deposited in the United States mails, postage prepaid; or the time any other written notice is personally delivered to the recipient or is delivered to a common carrier for transmission, or actually transmitted by the person giving the notice by electronic means, to the recipient; or the time any oral notice is communicated, in person or by telephone or wireless, to the recipient or to a person at the office of the recipient who the person giving the notice has reason to believe will promptly communicate it to the recipient.