Resolved -
Issue has been resolved on Proofpoint's end.
Aug 14, 15:35 EDT
Update -
A workaround has been implemented, and emails should begin processing normally.
Aug 14, 11:36 EDT
Identified -
An issue has been identified with Proofpoint causing email delivery and receiving to be impacted. ITS is aware and taking steps to remediate.
Aug 14, 10:30 EDT