The Proofpoint spam management system is an email filtering tool. To protect ASTATE from virus attacks and to protect you from receiving hundreds of spam messages, all incoming email is filtered by Proofpoint, which is an anti-spam and anti-virus product.
All incoming email is filtered by a server. Messages that contain a virus, or spam, or inappropriate content can either be deleted or "scored." In the case of spam, the message score indicates the probability that the message is spam --- so a message scoring 100 would have 100% chance of being spam (definite spam) and a message scoring 0 would have 0% chance of being spam (legitimate correspondence). Messages scoring high enough to probably be spam are quarantined, and messages scoring below 50 are sent directly to your inbox.