Sending, receiving, and organizing email in Outlook on the web for business
Hi @Corrective,
To help narrow down the cause of the issue, could you please provide a bit more information?
- Are all users in your organization affected, or is the issue limited to one specific mailbox?
- Can the affected mailbox receive emails from internal users, or does the problem only occur with external senders?
- Could you please share a screenshot of the sender's complete timeout error or NDR (Non-Delivery Report) message?
In addition, please contact your organization's administrator and ask them to run a Message Trace in the Exchange admin center under Mail flow > Message trace. This can help determine whether the message successfully reached Exchange Online (Microsoft 365's email service) and what status was recorded for it, such as Delivered, Pending, Failed, Quarantined, or Filtered as spam. The Message Trace results can provide valuable information for further troubleshooting.
Thank you for your time. I look forward to your update.