According to my configuration Postfix should be replying with a permanent error code (554), but it keeps sending a temporary one (454). Why is it doing that?

You probably have soft_bounce = yes. Also, if there is a temporary DNS problem, Postfix automatically converts permanent errors to temporary ones. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.