First, check the headers of your mail message to see if the mail really came from MIT and was not just forged by someone at your own or another site (more likely). The Received lines will tell you where the mail actually came from.
If you still have concerns related to MIT's network connection or e-mail system, including cases in which you've received unwanted messages that appeared to come from an mit.edu address, the correct place to send your e-mail message is postmaster@mit.edu.