The following came out in the "Academic Technology News" yesterday:
To put the new spam filtering in perspective, consider the following: WWU errs on the side of caution to ensure that we do not filter any legitimate email; even with this 'cautionary' configuration more than 80% of all inbound email to campus is filtered out of our email system as known spam, compared to around 65% with our previous solution. In terms of numbers, that means that the staggering number of 1.3 million spam emails are filtered from your incoming mail each day.There you have it. 1.6 million messages a day! Our Exchange system has around 6000 email accounts.
Number of emails received: 1.6 million
Number of messages filtered: 1.3 million
Number of messages delivered: 0.3 million