I received an e-mail message from Proofpoint. What is this message?

You have received a "Spam Digest" report that is automatically generated from the Proofpoint system listing messages that are now being held in a special Quarantine. Once a day at 7 a.m., Monday through Friday, a digest message is sent showing a list of your new e-mail messages that have arrived from outside of CSUSB that appear to be spam. The report only includes messages added to the Quarantine since the last report was generated. A message placed in the Quarantine resides there for a month and then is automatically deleted from the Quarantine system.