Send & Receive Issues

Fix Shared Mailbox Emails from Business Central Going to Spam

Bushra Parveen Oct 23, 2026 868 views

Question details

The user needs to resolve an issue where emails sent via Dynamics 365 Business Central are incorrectly flagged as spam.

How to Fix Shared Mailbox Emails from Business Central Going to Spam

Product: Dynamics 365 Business Central
Device & OS: not provided
Scenario: Sending messages to clients or partners using an Exchange Online shared mailbox linked to Business Central.
Observed behavior: Emails sent through the shared mailbox frequently land in the recipients' spam folders, whereas emails sent from personal accounts are delivered to the inbox normally.

Before you start

Before contacting support, ask a recipient to provide the raw internet headers of a message that landed in their spam folder, as this contains critical routing data needed for troubleshooting.

Solution 1Recommended

Contact Dynamics 365 Support for Configuration Review

Reach out to the dedicated Dynamics 365 Business Central support team to investigate the routing configuration and message-delivery path.

Because the messages are generated by an application and routed through Exchange Online, complex authentication or filtering rules might be overriding standard delivery policies. The support team has the necessary tools to trace the exact failure point.

Access the Admin Center

Open a Service Request

Navigate to the 'Support' section on the left-hand menu and select 'Help & support' to open a new service request.

Provide Diagnostic Details

Request a review of the shared mailbox settings, Business Central SMTP authentication, and Exchange Online filtering rules. Attach the email headers you collected for faster resolution.

Contact Dynamics 365 Support for Configuration Review

Solution 2

Verify Domain Email Authentication Records

Ensure your domain's DNS records correctly authorize Business Central and Exchange Online to send emails on your behalf.

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Frequently Asked Questions

Why do shared mailbox emails go to spam while personal emails do not?

Emails sent through applications like Business Central via shared mailboxes can trigger bulk-sending spam filters or fail SPF/DKIM alignment if not explicitly configured. Personal accounts usually send directly through authenticated SMTP, bypassing these specific application-layer triggers.

How can I view the email headers of the spam message?

In most desktop email clients like Outlook, the recipient can double-click the spam email to open it in a new window, go to File > Properties, and copy the text inside the 'Internet headers' box at the bottom.

Does Business Central require a special license for the shared mailbox to send emails?

Shared mailboxes in Exchange Online generally do not require a separate paid license unless they exceed 50 GB in storage or require advanced archiving features. However, they must be properly mapped and delegated to licensed Business Central users.

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