This study explores the textual and visual organization of Greek letters on papyrus. While previous scholarship has focused on cataloguing formulaic elements in epistolary texts, it has often overlooked how these elements, along with other linguistic features such as discourse particles, tense-aspect marking, and pronouns, provide cues for discourse segmentation. This contribution discusses the preliminary results of an annotation framework designed to capture these aspects more effectively and examines the correspondences between discourse structure and pragmatic concepts such as ‘speech act’. In the second part of the study, we identify various layout elements that contribute to the visual organization of the texts. We preliminarily assess how sensitive writers were to the type of speech act being expressed and the ways in which visual cues were used to emphasize certain thematic blocks within the letters. This integrated analysis offers new insights into the complex interactional form of communication presented by ancient letters.