Spam filtering, as well as antivirus identification and blocking of certain attachments is conducted centrally on all email coming into the Institute. For more information see here.
SNS computing also conducts additional secondary spam filtering at the school level using spamassassin. Messages identified as spam by this secondary spam filtering have their subject line re-written with the prefix [SPAM]. Our mail filtering is also setup so that if you create a mail folder named SPAM these messages will be diverted into this folder automatically.