(Update as of 3:51 P.M. PST on Dec. 15th) RESOLVED
Google is reporting that all email delivery problems have been fixed and services are now fully operational. Stay up-to-date with the latest updates by visiting IS&T’s Systems Status page.
(original message)
IS&T is aware of and monitoring a current issue with Gmail users’ messages not being delivered. At this time, Google is currently working to resolve the issue on their end.