Most modern-day historians are uncertain of who wrote the Epistle to the Hebrews, but they also seem to be in agreement that the author isn't St. Paul.
Looking at the letter, I can see why. All of the letters of St. Paul are introduced with some variation of "Paul, an apostle of Jesus Christ" followed by St. Paul stating who he is writing to. Hebrews, however, cuts straight to the point"
God, who at various times and in various ways spoke in time past to the fathers by the prophets, has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds...
It almost seems like there was an introduction that was cut out of the text. Also, the entire letter seems to be much more dry than something that would be written by St. Paul. It just seems...different.
The Coptic church, however, still holds St. Paul to be the author. What evidence do we have to suggest that this was the case?