Okla. Stat. tit. 41, § 41-9: Service of notice - Termination of tenancy

The notice to terminate the tenancy required in this chapter may

be served on the tenant, or, if he cannot be found, by delivering

the same to some person over the age of twelve (12) years, residing

on the premises, having first made known to such person the contents

thereof; or, if service cannot be made by the use of reasonable

diligence on the tenant or on any person over the age of twelve (12)

years residing on the premises, the same may be served by posting

said notice at some conspicuous place on the building on said

premises and if there be no buildings on said premises then said

notice shall be posted at some conspicuous place on said premises

and if said notice is posted, a copy of said notice shall be mailed

to the tenant at his last-known address by registered mail and such

notice shall operate to terminate the tenancy at the end of the

period after the date of such posting and mailing that it would have

been terminated by personal service of such notice on the date of

such posting and mailing; provided, that in no event shall such

posting and mailing terminate any tenancy within a period of less

than ten (10) days from the date of such posting and mailing.