Mississippi Code Title 27. Taxation and Finance § 27-67-4

(1) For purposes of this article, a “mail order sale” is a sale of tangible personal property or specified digital products, ordered by mail or other means as described in subsection (2)(e), to a purchaser who is in this state at the time the order is remitted, from a person who receives the order in another state of the United States, or in a commonwealth, territory or other area under the jurisdiction of the United States, and which person transports the property or products or causes the property or products to be transported, whether or not by mail, from any jurisdiction of the United States, including this state, to the purchaser in this state who ordered the property or products or to another person in this state for whom the purchaser ordered the property. For purposes of this definition, it will be presumed that every purchaser resident in this state who remits an order shall have been in this state at the time the order was remitted.

(2) Every person doing business in this state who makes a mail order sale is subject to the power of this state to levy and collect the tax imposed by this article when:

(3) Every person engaged in the business of making mail order sales is subject to the requirements of this article for cooperation in collection of taxes and in administration of this article, except that no fee shall be imposed upon such person for carrying out any required activity.

(4) The tax required under this section to be collected, and any amount unreturned to a purchaser that is not tax but was collected from the purchaser under the representation that it was tax, constitute funds of the State of Mississippi from the moment of collection.