Lost Epistles of Paul: What Was Left Outside the New Testament

What happened to the letters Paul wrote but we never received?The Apostle Paul explicitly mentions letters that are absent from our New Testament. In 1 Corinthians 5:9, he refers to a previous letter warning against associating with the immoral. In 2 Corinthians, he describes writing "e;out of much affliction and anguish of heart, with many tears."e; In Colossians 4:16, he instructs churches to ex...