I had noticed that Paul often starts and/or ends his letters giving honor to God, Jesus, and sometimes the Holy Spirit, so I went through them to check. Here is my report, using the ESV.
New Testament books greetings and closings
(G = God, J = Jesus, S = Son, H = Holy Spirit)
G JS H Romans 1:1-8
G J Romans 16:25-27
G J 1 Corinthians 1:1-4
J 1 Corinthians 16:23
G J 2 Corinthians 1:1-2
G J H 2 Corinthians 13:14
G J Galatians 1:1-3
J Galatians 6:18
G J H Ephesians 1:3, 13
G J Ephesians 6:23
G J Philippians 1:2
J Philippians 4:21, 23
G J Colossians 1:1-2
G JS H 1 Thessalonians 1:1-5, 10
J 1 Thessalonians 5:28
G J 2 Thessalonians 1:1-2
J 2 Thessalonians 3:18
G J 1 Timothy 1:1-2
G J 1 Timothy 6:11-16
G J 2 Timothy 1:1-2
G J Titus 1:1-4
J H Titus 3:5-6
G J Philemon 3
J Philemon 23 (Jesus
G JS Hebrews 1:1-2
G J Hebrews 13:20-21
G J James 1:1
G J H 1 Peter 1:2-3
G J 1 Peter 5:14 (Jesus)
G J 2 Peter 1:1-2
G JS 1 John 1:3-4
G J 1 John 5:20
G JS 2 John 1
G JS 2 John 9
G JS Jude 1
G J H Jude 20, 25
G J Revelation 1:1-2
G J ? Revelation 22:17-21