My latest book recommendation is Ancient Letters and the New Testament by Hans-Josef Klauck. Klauck’s work is the new standard for scholarly yet approachable works to ancient letter writing. Klauck explores many important topics such as the postal system, epistolary theory, rhetoric, and classifying letters. Additionally, Klauck includes an annotated list of all the ancient letters writers, divided between Latin and Greek. Moreover, Klauck’s excellent bibliographies alone make this work a worthy purchase. Yet another useful feature is the example(s) included at the close of each section. Essentially Klauck’s work could be used as either a textbook or a reference work. I highly recommend this work and consider it the new gold standard of its genre.