O.C.G.A. § 40-3-42

In instances when an application for title is required to be submitted within a certain time period, proof of mailing within the designated period allowed for submission of the documents, as evidenced by a United States Postal Service postmark, shall be prima-facie proof that the application was timely submitted. Additionally, when the law provides for a penalty for the untimely submission of a title application, the responsibility for the collection of such penalty shall be that of the department.