Cal. Gov't Code § 89002
(a) Except as provided in subdivision (b), a mailing is prohibited by Section 89001 if all of the following criteria are met:
(2) The item sent either:
(b) Notwithstanding subdivision (a), a mass mailing of the following items is not prohibited by Section 89001:
(9)
(A) An announcement of any meeting or event of either of the following:
(c) For purposes of this section, the following definitions apply:
(3) “Substantially similar” is defined as follows:
(A) Two items are “substantially similar” if any of the following applies:
(iii) Both of the following apply to the items mailed:
(4) “Unsolicited request” is defined as follows:
(C) A previously unsolicited request to receive an agency newsletter or mass mailing on an ongoing basis shall not be deemed to have become solicited by the sole fact that the requestor responds to an agency notice indicating that, in the absence of a response, the requestor’s name will be purged from the mailing list for that newsletter or mass mailing. A notice in the following language shall be deemed to meet this standard:
“The law does not permit this office to use public funds to keep you updated on items of interest unless you specifically request that it do so.”
Inclusion of a similar notice in other items does not constitute a solicitation under this section.