UC Network Fact Sheet

Email Statistics

Data obtained between April 9 - 30. This includes 12 day Easter Break.

• 150,000 emails were received
• 85,000 of 150,000 emails automatically deleted by corporate software
• 75,000 emails were sent from this building
• 9,000 delayed of sent or received

Delayed Statistics

• 150 emails released
• 70 out of 150 emails were student to teacher assignments
• 60 out of 150 emails were student to student communication
• 20 out of 150 emails were Internal to External / External to Internal communication
• 8,850 emails deleted

Five Step Message Blocking

• As external mail is received it is checked with an external database of blacklisted IP addresses used by known spammers.
• All mail is then scanned for viruses. Mail with viruses are deleted.
• All external mail is then given a heuristic value that determines its spam probability. Values greater than 5 are deleted.
• All mail is then scanned against 20 different dictionaries and 16 sets of rules. Depending on the dictionary and rule, email is then either deleted, blocked, or allowed.
• All blocked email is reviewed and either deleted or released (this occurs once to twice a day).

Rules that affect you

• Freshmen and Sophomores can only email teachers.
• Emails to more than 40 people are delayed.
• Teacher to teacher emails (individual to individual internal) are not blocked/deleted unless they contain a virus, unaccepted attachment, or are too large.