Oregon Revised Statutes Procedure in Civil Proceedings § 25.085

(1) In any proceeding under ORS 25.080, service of legal documents upon an obligee may be by regular mail to the address at which the obligee receives public assistance, to an address provided by the obligee on the obligee's application for child support enforcement services or to any other address given by the obligee. When service is authorized by regular mail under this section, proof of service may be by notation upon the computerized case record made by the person making the mailing. The notation must set forth the address to which the documents were mailed, the date they were mailed, the description of the documents mailed and the name of the person making the notation. If the documents are returned by the postal service as undeliverable as addressed, that fact must be noted on the computerized case record. If no new address for service by regular mail can be obtained, service must be by certified mail, return receipt requested, by personal service upon the obligee, or by any other mail service with delivery confirmation.

(2) Notwithstanding any other provision of this chapter or ORS chapter 110 or 416, when a case is referred to this state by a public child support agency of another state for action in this state, there is no requirement that an obligee, present in the initiating state and receiving child support enforcement services from that state, be served in any action taken in this state as a consequence of the interstate referral. In such cases the requirement to serve the obligee that would otherwise apply is satisfied by sending to the initiating agency in the other state, by regular mail, any documents that would otherwise be served upon the obligee.

(3) The appropriate child support agency of the state shall make any mailings to or service upon the obligee that is required by this section.