CCP §684.120: (a) Except as otherwise provided in this title, if a writ, notice, order, or other paper is to be served by mail under this title, it shall be sent by first-class mail (unless some other type of mail

(a) Except as otherwise provided in this title, if a writ, notice, order, or other paper is to be served by mail under this title, it shall be sent by first-class mail (unless some other type of mail is specifically required) and shall be deposited in a post office, mailbox, sub-post office, substation, mail chute, or other like facility regularly maintained by the United States Postal Service, in a sealed envelope, with postage paid, addressed as follows: (1) If an attorney is being served in place of the judgment creditor or judgment debtor as provided in Section 684.010 or 684.020, to the attorney at the last address given by the attorney on any paper filed in the proceeding and served on the party making the service. (2) If any other person is being served, to such person at the person’s current mailing address if known or, if unknown, at the address last given by the person on any paper filed in the proceeding and served on the party making the service. (3) If the mailing cannot be made as provided in paragraph (1) or (2), to the person at the person’s last known address. (b) Service by mail is complete at the time of deposit; but, unless the court prescribes a shorter period of time, any prescribed period of notice and any right or duty to do any act or make any response within any prescribed period or on a date certain after a paper is served by mail is extended: (1) Five days if the place of address is within the State of California. (2) Ten days if the place of address is outside the State of California but within the United States. (3) Twenty days if the place of address is outside the United States. (c) The writ, notice, order, or other paper served by mail under this section shall bear a notation of the date and place of mailing or be accompanied by an unsigned copy of the affidavit or certificate of mailing. This subdivision is directory only.