A post office certificate of mailing to the named insured at the named insured's last-known address shall constitute conclusive proof that the named insured received the notice of cancellation or nonrenewal on the third calendar day after the date of the certificate of mailing.
Or. Admin. Code § 836-085-0050
Stat. Auth.: ORS 731
Stats. Implemented: ORS 746.045, ORS 746.055, ORS 746.160(3) & ORS 746.240