SDCL § 15-9-20: Personal service without state in lieu of service by publication--Admission of service.

In any of the cases where service of summons, writ, order, or decree by publication is authorized in lieu thereof the same may and without any order of the court at the option of the party making service, be personally served upon any defendant in person without the state, or any such defendant may admit such service, and as to a defendant so served, no publication or other proceedings relating thereto shall be necessary.