All mail for our domain should go through comm1. However, there are some servers that receive or send mail directly. This situation can occur if the server is not configured correctly. It can also occur if Datacomm doesn't know it's a mailer and does not have a MX record for the server in our DNS or a mailertable entry. There are organizations that are dedicated to stamping out spam.
Current laws regarding spam vary, with new legislation proposed both nationally and locally.
Data Communications is concerned with server level control on the campus mailer. Information for your server is included in this document while a separate document will include suggestions for users to control spam at the client level. Ideally, preventing spam from ever being sent would be the best fix. Preventing spam is difficult for a number of reasons. The variety and quality of software available to monitor spam is limited, but this will probably change as the problem continues to increase.