Well, we have a zero tolerance policy for spam here. Anybody who was around last year when we were getting hit by that spam bot many times a day knows why I have a short fuse when it comes to that stuff. And circumventing whatever anti-spam countermeasures Warrior installed in the board last year by using the PM system is just dirty.
But, this was a person (presumably) and not a spam bot, so I attempted to give him/her a chance to stop what they were doing. But, they decided to ignore my PMs and continued to just sit there scanning the member list and PM-ing people, (I could see them doing this on the Who's Online screen and Admin CP.) so I was forced to take action to protect everyone else's privacy.
So, we'll attempt to put that behind us and go on with our usual routine.