That won't work.
Back in the day, 90% of the spam accounts came from eastern Europe, specifically the RIPE network. It was actually a joke that if we just removed the RIPE network from the internet, the spam problem would have been solved
But last year a lot of the spam shifted and came from China. The RIPE network was no longer a big problem.
And starting this year, it appears to be mostly coming from India. Also, I'm not getting it from quite a lot of random around the world countries, implying its from bot networks or VPNs.
Point being the problem seems to be shifting over time to different countries . . .