Miss. R. Civ. P. 45 governs the service of subpoenas in Mississippi: 

(c) Service. (1) A subpoena may be served by a sheriff, or by his deputy, or by any other person who is not a party and is not less than 18 years of age, and his return endorsed thereon shall be prima facie proof of service, or the person served may acknowledge service in writing on the subpoena. Service of the subpoena shall be executed upon the witness personally. Except when excused by the court upon a showing of indigence, the party causing the subpoena to issue shall tender to a non-party witness at the time of service the fee for one day’s attendance plus mileage allowed by law. When the subpoena is issued on behalf of the State of Mississippi or an officer or agency thereof, fees and mileage need not be tendered in advance. (2) Proof of service shall be made by filing with the clerk of the court from which the subpoena was issued a statement certified by the person who made the service, setting forth the date and manner of service, the county in which it was served, the names of the persons served, and the name, address and telephone number of the person making the service. – See more at: http://www.rcfp.org/mississippi-privilege-compendium/v-procedures-issuing-and-contesting-subpoenas#sthash.hOCxKsrL.dpuf