How did Paul write and send his letters to the churches?
Paul wrote his letters as the Holy Spirit inspired him, then dispatched them by courier to the various churches. Romans, for instance, was sent from Corinth to Rome with Phoebe, accompanied by friends such as Titus and Timothy. He wrote without knowing his writings would become the Canon of Scripture.
Les explains that Paul just wrote as the Holy Spirit inspired him, fired the letter off to the various churches by courier, and had no idea his writings would become what we call the Canon of Scripture. For example, Paul sent the Book of Romans to Rome from Corinth with Phoebe, a lady, and others went with some of his friends, Titus and Timothy and so forth. Les points out that whether Paul knew it or not, he put his letters out under the format of first doctrine, then reproof, then correction, and then instruction in righteousness. These letters were written during his early missionary travels, beginning about A.D. 40 after he returned from three years of instruction with the Lord at Mount Sinai. They became what we know as Romans, 1 and 2 Corinthians, and Galatians.