Messages from corporate emails were being undelivered at the start of the new year due to a Microsoft Exchange Server bug. Microsoft published an update on 1st January 2022, stating that emails were getting stuck in transport queues of on-premise Exchange Servers. This problem was caused by a “date check failure” in the servers malware scanning engine.
Microsoft has published 2 solutions for users to fix the problem. The first solution is an automated one, while the other is a manual solution.