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| 1 | +--- |
| 2 | +title: Error occurred while synchronizing or receiving an email |
| 3 | +description: Fixes the 80040216, ServiceUnavailable, IncomingMailboxInternalCrmError, or ErrorInternalServerTransientError error during server-side synchronization in Dynamics 365. |
| 4 | +ms.reviewer: |
| 5 | +ms.date: 12/31/2024 |
| 6 | +ms.custom: sap:Email and Exchange Synchronization |
| 7 | +--- |
| 8 | +# An error occurs when receiving or synchronizing an email in a Microsoft Dynamics 365 mailbox |
| 9 | + |
| 10 | +This article helps you resolve error messages logged in a Microsoft Dynamics 365 mailbox record during server-side synchronization. |
| 11 | + |
| 12 | +_Applies to:_ Microsoft Dynamics 365 |
| 13 | +_Original KB number:_ 4477141, 4471977, 4471949, 4471948 |
| 14 | + |
| 15 | +## Symptoms |
| 16 | + |
| 17 | +One of the following alerts is logged in the [Alerts](/power-platform/admin/monitor-email-processing-errors#view-alerts) section of a Dynamics 365 mailbox record: |
| 18 | + |
| 19 | +- > An error occurred while synchronizing the item \<Item Name\> from Microsoft Dynamics 365 for the mailbox \<Mailbox Name\>. |
| 20 | + > |
| 21 | + > **Email Server Error Code**: Crm.80040216. An unexpected error occurred. |
| 22 | +
|
| 23 | +- > An error occurred in receiving email for the mailbox \<Mailbox Name\> while connecting to the email server. The owner of the associated email server profile \<Profile Name\> has been notified. The system will try to receive email again later. |
| 24 | + > |
| 25 | + > **Email Server Error Code**: Http server returned ServiceUnavailable exception |
| 26 | +
|
| 27 | +- > An internal Microsoft Dynamics 365 error occurred while receiving email through the mailbox \<Mailbox Name\>. The owner of the associated email server profile \<Profile Name\> has been notified. The system will try to receive email again later. |
| 28 | + > |
| 29 | + > **Email Server Error Code**: IncomingMailboxInternalCrmError |
| 30 | +
|
| 31 | +- > An unexpected error occurred while receiving email. Mailbox \<Mailbox Name\> didn't synchronize. The owner of the associated email server profile \<Profile Name\> has been notified. |
| 32 | + > |
| 33 | + > **Email Server Error Code**: ErrorInternalServerTransientError |
| 34 | +
|
| 35 | +## Cause |
| 36 | + |
| 37 | +The error messages might occur when [server-side synchronization](/power-platform/admin/server-side-synchronization) tries to synchronize an item with Microsoft Exchange but encounters issues such as internal errors or a 503 (Service Unavailable) error. Typically, these are temporary problems, and synchronization usually succeeds in the next cycle (approximately every 15 minutes). |
| 38 | + |
| 39 | +## Resolution |
| 40 | + |
| 41 | +- If the issue doesn't persist during the next synchronization cycle (typically in 15 minutes), you can ignore it. |
| 42 | +- If the issue persists and the mentioned item isn't being synchronized by server-side synchronization, you can contact Microsoft Support through the **Help + Support** experience in the [Power Platform admin center](https://admin.powerplatform.microsoft.com/support). |
| 43 | +- Additionally, there might be an issue with your email server, so you can first verify that you can send and receive emails successfully with your email service. |
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