Suggestion,
I have noticed that the "Epoch attacks" are with passfiles epoch 2014-2015
They passed as 6-7 months of the latest hits
They are attacks "email: user"
It is very likely to the password that date "2014-15" does not correspond to present day
One attack of 100 "hits" unrevised and using old plains
hopefully less than half will be active
My suggestion if you want to give something valid to user
avoid massive posting unchecked because people think they are posting fakes.
It's just a suggestion