Email delivery issues in Exchange Online: Microsoft investigating
Learn more about causes and impacts
Microsoft is investigating email delivery issues in Exchange Online, causing "Server Busy" errors and delays in receiving external emails. The problems could be related to the incorrect application of anti-spam rules. There have also been previous problems accessing email inboxes.
Microsoft is investigating email delivery issues in Exchange Online that are causing "Server Busy" errors and delays in receiving emails from external organizations.
User reports
According to user reports online, the Exchange Online issues began this morning, impacting Microsoft 365 customers around the world in the Americas, Europe and Asia.
Cause of inconveniences
In a subsequent update, Redmond announced that the cause of the problems may be related to the incorrect application of IP address anti-spam rules for affected customers. Some users have reported seeing thousands of emails added to their outbound queue due to Exchange Online's spam filtering.
Previous stumbles
Today's incident follows several Exchange Online issues earlier this year that prevented customers around the world from accessing their email inboxes and sending or receiving emails.
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