Mail Protection Gateway (MPG) Update

Since its implementation in May 2017, the Mail Protection Gateway (MPG) has blocked and filtered 90% of all incoming Caltech email, including:

  • 211,079,364 emails from questionnable senders
  • 9,344,759 spam emails
  • 2,920 virus emails
  • 201,146 emails with malicious links

For more information about the Mail Protection Gateway, visit, or to check your quarantine, visit