I had a member "casinondbf" signing up yesterday which was suspect to me
banned him, I noticed you have one latest member ndbf.com,
this is sure the same.
There is the no dep forum from a member "peacefrog"
He was on my site too yesterday, but did not see him sending any pm.
Do you know which site it was what they were spamming your members via pm?
Just wanna be sure we get the right ones,
you have my full support.
Btw, I do moderate new members.
I check them out 1st i.e. at stopforumspam.com and doing some google search before I approve them, its a bit more work but worth.
Maybe you might check on this too.