I don't know if this is the right place, but the server just spammed me every PM I've ever had on the server....My Mobile was going insane with emails.
Mail spam is caused by Cannon's mail installing - all the mail that you were about to recieve was... "pending". After mail system installation, it's been sent. So you recieved it.
PM problems are related to bad conversion from previous forum engine. AFAIK, there's no solution for that besides removing the faulty messages.