Tennessee Code Title 36. Domestic Relations § 36-5-807

(a) To the maximum extent feasible, the department's automated child support enforcement system shall be utilized to carry out the expedited procedures of this part and the system may be used for the issuance and service of any requests, administrative orders, or subpoenas necessary to enforce child support obligations and such automated service shall be effective for all purposes in this part. Electronically reproduced signatures shall be effective to issue any orders or subpoenas pursuant to this part.

(b) Notwithstanding subsection (a), any requests, administrative orders or administrative subpoenas required to be issued pursuant to this part may be transmitted to any party or person by any method chosen by the department, including but not limited to: certified mail, return receipt requested, regular mail, electronic mail, facsimile transmission, or by personal service, and may be generated by computer or on paper.

(c) If an administrative order or administrative subpoena is returned or otherwise not deliverable, then service shall be had by any alternative method chosen by the department, as listed in subsection (b). Before taking action against an individual or entity for failure to comply with this part, the department shall ensure that service of the administrative order, administrative subpoena, or request, was confirmed by certified mail or by personal service.