ORS § 648.070
A person making service of process authorized by ORS 648.061 shall make the service by delivering a copy of the process in person or by certified mail to the Office of the Secretary of State. The service shall be sufficient and valid personal service upon the persons not domiciled in this state to whom ORS 648.061 applies if the plaintiff immediately sends notice of the service and a copy of the process by certified mail to the principal office of the persons against whom the process or pleadings are directed, and the return receipt of the latter and plaintiff's affidavit of compliance with this section are appended to the process and entered as a part of the return thereof. The defendant persons against whom the process or pleadings are directed shall have 30 days after the date of mailing of the process or pleadings in which to appear and plead. Personal service outside the state in accordance with the statutes of Oregon relating to personal service of summons outside the state shall relieve the plaintiff from mailing copies of the summons or process by registered mail as provided in this section.
ORS 648.070