Minn. Stat. § 279.091

On or before March 20 immediately following the filing of such list with the court administrator of district court, the county auditor shall cause the notice and the pertinent portion of the list of delinquent real property to be mailed to all real property taxpayers and in addition those parties who have filed their addresses pursuant to section 276.041 . Failure to mail the notice and the pertinent portions of the list shall not be deemed to be a material defect to affect the validity of the judgment and sale.