Microsoft Incident Resulting in Delivery Issues to M365

Updates

1. Monitoring

   23 minutes ago

   Microsoft is experiencing an incident causing an increased volume of deferred emails across all M365 regions. The affected responses are returning "451 4.7.500 Temporary server error" and "421 4.3.2 The maximum number of concurrent server connections has exceeded a limit, closing transmission channel". Our teams are actively monitoring the situation. Sending to other email providers is not affected