Iowa Code § 446.2: Notice of sale.

For each parcel sold, the county treasurer shall notify the party in whose name the parcel was taxed, according to the treasurer’s records at the time of sale, that the parcel was sold at tax sale. The notice of sale shall be sent by regular mail within fifteen days from the date of the annual tax sale or any adjourned tax sale. Failure to receive a mailed notice is not a defense to payment of the total amount due.