We did have pre-warning from a guy asking where he could download a bit of software that was a spam bot program and it all went pete tong from there.
There is a bot that is on the vb forums to combat this sort of attack but admin would have to install it, software is years out of date which isn't helping so manual checks is the only safe way atm. There are plenty of IP checkers out there to help with any banned IPs.
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