26.50.123. Service by mail.
(1) In circumstances justifying service by publication under RCW 26.50.085(1), if the serving party files an affidavit stating facts from which the court determines that service by mail is just as likely to give actual notice as service by publication and that the serving party is unable to afford the cost of service by publication, the court may order that service be made by mail. Such service shall be made by any person over eighteen years of age, who is competent to be a witness, other than a party, by mailing copies of the order and other process to the party to be served at his or her last known address or any other address determined by the court to be appropriate. Two copies shall be mailed, postage prepaid, one by ordinary first class mail and the other by a form of mail requiring a signed receipt showing when and to whom it was delivered. The envelopes must bear the return address of the sender.
(2) Proof of service under this section shall be consistent with court rules for civil proceedings.
(3) Service under this section may be used in the same manner and shall have the same jurisdictional effect as service by publication for purposes of this chapter. Service shall be deemed complete upon the mailing of two copies as prescribed in this section.