The scammers are getting so good, they can reproduce logos, letterheads, etc so authentically.
As said, dump them and if your block list is full delete the oldest blocks, so you can add the new ones.
My experience is, scammers seldom scam you again from the same address, they will use the same scam but from a different location, if not multiple ones.
My view is, some internet sellers sell customers email address's, as the only place I have used that address is on line.
My ISP provides me with multiple email address's.