SpamAssasin’s daemon, spamd, died at some point on mx2 allowing a lot more spam than would normally make it through.  It has been restarted.

     I am in the process of replacing the existing mail servers with new servers with newer anti-spam measures.  The existing servers are three years old now and spammers have adapted to get past the old measures.  The new servers will rely more heavily on Bayesian filtering (which is adaptive) with a much improved back end capable of holding a lot more sample data thus enabling more accurate filtering.