(b) A child support subpoena issued pursuant to section one hundred eleven-p of the social services law to public utility companies and corporations, including but not limited to cable television, gas, electric, steam, and telephone companies and corporations, as defined in section two of the public service law, may be served by regular mail, or through an automated process where information sought is maintained in an automated data base. All other child support subpoenas issued pursuant to section one hundred eleven-p of the social services law shall be served in accordance with the provisions of subdivision (a) of this section.