So, the argument is because the hash is displayed it can be reversed by subsequently hashing every known combination of characters with every known mail provide

So, the argument is because the hash is displayed it can be reversed by subsequently hashing every known combination of characters with every known mail provider? I'll give a shiny nickel to the first person that can reverse this hash: 9b60573dba6b13029b245bbdf7d01323 Moral: Not everyone uses some variation on their name nor do they use the most common email providers.