[Australia] Exchange Online Protection servers may cause delays in email delivery

This incident has been resolved.

It looks like Microsoft has resolved the EOP issue. We are no longer observing any email queues before EOP servers, and all messages are being delivered without delays. We will continue to monitor the situation.

Microsoft has confirmed that the issue is on their end. The issue ID is EX1079935.

While email delays in Australia are decreasing, we are now seeing the UK region slowly starting to be affected. We anticipated this and have already warmed up failover services to help mitigate the impact as the issue emerges in this region. Our services are continuously retrying to send messages that were previously stuck in queues before reaching the EOP servers so that we can send them through healthy EOP instances. All messages will be delivered with signatures, although some may be delayed.

Microsoft is currently experiencing problems with Exchange Online Protection (EOP). EOP servers appear to have degraded performance and are slow to process emails entering and leaving Microsoft 365 tenants. As a result, some messages processed by CodeTwo may also be delayed while they wait for EOP to scan them before being delivered to final recipients.

We have reported the issue to Microsoft and are waiting for a resolution. In the meantime, we have scaled up our services to increase the chances of routing emails through EOP servers that are not affected by this problem.

What should you do if you're impacted?
Inform your users that email delivery might be delayed (usually by just a few minutes or less) and wait for Microsoft to resolve the issue. Please note that this is a Microsoft-side problem, and it also affects users who are not using CodeTwo or any other smart hosts in the affected region.

All signatures are added normally.