Okla. Stat. tit. 68 § 3127
The county treasurer, according to the law, shall give notice of the resale of such real estate by publication of said notice once a week for four (4) consecutive weeks preceding such sale, in some newspaper, having been continuously published one hundred four (104) consecutive weeks with admission to the United States mails as second-class mail matter, with paid circulation and published in the county where delivered to the mails, to be designated by the county treasurer; and if there be no paper published in the county, or publication is refused, the county treasurer shall give notice by written or printed notice posted on the door of the courthouse. Such notice shall contain a description of the real estate to be sold, the name of the record owner of said real estate as of the preceding December 3l or later as shown by the records in the office of the county assessor, which records shall be updated based on real property conveyed after October 1 each year, the time and place of sale, a statement of the date on which said real estate taxes first became due and payable as provided for in Section 2913 of this title, the year or years for which taxes have been assessed but remain unpaid and a statement that the same has not been redeemed, the total amount of all delinquent taxes, costs, penalties and interest accrued, due and unpaid on the same, and a statement that such real estate will be sold to the highest bidder for cash. It shall not be necessary to set forth the amount of taxes, penalties, interest and costs accrued each year separately, but it shall be sufficient to publish the total amount of all due and unpaid taxes, penalties, interest and costs. The county treasurer shall, at least thirty (30) days prior to such resale of real estate, give notice by certified mail, by mailing to the record owner of said real estate, as shown by the records in the county assessor's office, which records shall be updated based on real property conveyed after October 1 each year, and to all mortgagees of record of said real estate a notice stating the time and place of said resale and showing the legal description of the real property to be sold. If the county treasurer does not know and cannot, by the exercise of reasonable diligence, ascertain the address of any mortgagee of record, then the county treasurer shall cause an affidavit to be filed with the county clerk, on a form approved by the State Auditor and Inspector, stating such fact, which affidavit shall suffice, along with publication as provided for by this section, to give any mortgagee of record notice of such resale. Neither failure to send notice to any mortgagee of record of said real estate nor failure to receive notice as provided for by this section shall invalidate the resale, but the resale tax deed shall be ineffective to extinguish any mortgage on said real estate of a mortgagee to whom no notice was sent. Beginning on April 24, 2008, no encumbrancer of real property in this state shall be permitted to file any instrument purporting to encumber real property in any county of the state with any county clerk unless the instrument states on its face the mailing address of such encumbrancer.
Okla. Stat. tit. 68, § 3127