Paul's Large Letters: Paul's Autographic Subscription in the Light of Ancient Epistolary Conventions

At the end of several of his letters the apostle Paul claims to be penning a summary and farewell greeting in his own hand: 1 Corinthians, Galatians, Philemon, cf. Colossians, 2 Thessalonians. Paul's claims raise some interesting questions about his letter-writing practices. Did he write any complete letters himself, or did he always dictate to a scribe? How much did his scribes contribute to the composition of his letters? Did Paul make the effort to proofread and correct what he had dicta...