Cal. Corp. Code § 5015
Any reference in this part, Part 2 (commencing with Section 5110), Part 3 (commencing with Section 7110), Part 4 (commencing with Section 9110), or Part 5 (commencing with Section 9910) to the time a notice is given or sent means, unless otherwise expressly provided, (a) the time a written notice by mail is deposited in the United States mails, postage prepaid; or (b) the time any other written notice, including facsimile, telegram, or other electronic mail message, 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 (c) the time any oral notice is communicated, in person or by telephone, including a voice messaging system or other system or technology designed to record and communicate messages, or wireless, to the recipient, including the recipient's designated voice mailbox or address on such a system, 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.
Ca. Corp. Code § 5015