I have gotten 19 emails in the past few days, all from chinese ip addresses.
I think the best way would be to block out china if it happens this much.
My user name here and my own forum's focus is military related. I thought that explained the numerous attempts to hack into my forum last year, and so I blocked china and a number of other potential future enemies there. A Chinese IP address tried to log in as me here, and so I suspected military "Hegemon" motives.
But perhaps not, maybe they are just crooks trying to steal industrial secrets or anything of value. Sorry you were nearly victimized but happy that it's not just me.