One of those things that happen on tinternet Tony - I didn't open the links as it was clearly spam.
Apology not really needed but it's nice to see and thanx.
Difficult to see how tightening up on registration could work - If the system used is automated it can be got around - If not it will create a lot of work.
You could regulate the PM system say by allowing people to choose only to receive PMs from selected people (moderators and 'buddys' for instance), but I can see the downside to this.
Fingers crossed that it doesn't happen too often.