Nice one Slimline, had to be done to save the forum. Thank you
Sure you've figured this yourself but I believe in the admin cp it should be relatively easy to remove the spam users through the Users & Groups => Prune Users option, should be an option to remove all their posts too.
Perhaps it would be helpful if we started making a list of the accounts that need to go etc, starting with the ones actively adding more spam right now? These have all posted since you put the forum back up.
ArifeawarfattY
EssayJor
alanbraken
Uncenuize
PortoPresto
vandervanyk
JessicaWilliams
neuronss
Abcrturfut
Cwesepoocoub
LordIpsum
Proplelvive
iwprtwcEC
aabcdefut
LordMartines
LeopoldKudasof
akipolkaso
Of course the alternative would be to mass prune new users by date (say nuke everyone who registered in the previous week or so), there would be collateral damage possibly of a few legit accounts but unlikely any real harm would be done...