We have exchange 2007 with latest service pack. recently we have one user accidentally opened up a spam email that contain viruses and the end result is it send out an bogus email to each of the user's contacts. We've tried completely cleaned out that pc, reformat the hard drive. Ever since the incident, we have a lot of junk and spam emails getting through our exchange server. Our server use Panda Cloud for exchange to filter spam. We want to know if there is any method or software out there that we can use to block that.