Cal. Corp. Code § 20
"Electronic transmission by the corporation" means a communication (a) delivered by (1) facsimile telecommunication or electronic mail when directed to the facsimile number or electronic mail address, respectively, for that recipient on record with the corporation, (2) posting on an electronic message board or network which the corporation has designated for those communications, together with a separate notice to the recipient of the posting, which transmission shall be validly delivered upon the later of the posting or delivery of the separate notice thereof, or (3) other means of electronic communication, (b) to a recipient who has provided an unrevoked consent to the use of those means of transmission for communications under or pursuant to this code, and (c) that creates a record that is capable of retention, retrieval, and review, and that may thereafter be rendered into clearly legible tangible form. However, an electronic transmission under this code by a corporation to an individual shareholder or member of the corporation who is a natural person, and if an officer or director of the corporation, only if communicated to the recipient in that person's capacity as a shareholder or member, is not authorized unless, in addition to satisfying the requirements of this section, the consent to the transmission has been preceded by or includes a clear written statement to the recipient as to (a) any right of the recipient to have the record provided or made available on paper or in nonelectronic form, (b) whether the consent applies only to that transmission, to specified categories of communications, or to all communications from the corporation, and (c) the procedures the recipient must use to withdraw consent.
Ca. Corp. Code § 20