There are seven letters by Paul and it is accepted that they were written by Paul, but no one knows clearly who wrote the rest. A critical enquiry into all this started only in the 18th century as there was no critical study of the matter. The accepted authorship of Paul is regarding the Epistles to Romans, First to Corinthians, Second to Corinthians, to Philippians, to Galatians, to Thessalonians and to Philemon. Thus, even though some other epistles are attributed to authorship by Paul, many scholars do not accept that those Epistles were written by Paul.

This sort of argument has been going on since the beginning of enquiry into the subject. Regarding authorship of the Gospels, they are all viewed to be anonymous, though they are attributed to Matthew, Mark, Luke and John. This helps in the view to be correct. Thus one of the similarities between epistles and...
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