E-Mails via Business Central to Customers

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Hello Dear Community,

We have a Customer who does have a Cloud Business Central Application.

A User is already able to send Emails.

Now another User wants to be able to send E-Mails .

However i am getting the following Error:

The user account which was used to submit this request does not have the right to send mail on behalf of the specified sending account., Cannot submit message.“.

Callstack:

"Email Editor"(CodeUnit 8906).SendOutbox line 8 - System Application by Microsoft version 26.0.30643.33860
"Email Editor"(Page 13).ValidateAndSendEmailData line 8 - System Application by Microsoft version 26.0.30643.33860
"Email Editor"(Page 13)."Send - OnAction"(Trigger) line 2 - System Application by Microsoft version 26.0.30643.33860

However i already added all permissions to the new User.

Thanks in Advance to the community!

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Dynamics 365 Business Central

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Sohail Ahmed 11,177 Super User 2026 Season 1 on at

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This error typically happens when the user trying to send the email doesn’t have Send As or Send on Behalf permissions for the specified sender email account in Microsoft 365 (Exchange Online).

✅ Here's how to fix it:

1. Check Email Account in BC:

Go to Email Accounts in Business Central.

Confirm which account is set as default or used in the action.

2. Grant Microsoft 365 Permissions:

Go to the Microsoft 365 Admin Center → Exchange Admin Center.

Under Recipients > Mailboxes, select the mailbox used for sending.

Open Mailbox delegation → Grant the new user Send As or Send on behalf permissions.

3. Wait for Permissions to Propagate:

Changes in Microsoft 365 may take up to 30–60 minutes to take effect.

Once permissions are properly set, the user should be able to send emails from that account via BC.

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RockwithNav 9,125 Super User 2026 Season 1 on at

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If you are using shared mail address then that user 2 needs to be granted that permission as of user 1. You need to add this user under mail delegation MS 365.

Blog - rockwithnav.wordpress.com/
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Valentin Castravet 32,693 Super User 2026 Season 1 on at

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It looks like emails are being sent from a shared mailbox, and the user doesn't have permission to send emails on behalf of the shared mailbox. To fix, grant the necessary permissions in the Exchange Admin Center. You can verify the sending address in the Email Accounts page in Business Centra, if it shows "Current User," it sends from individual user accounts; otherwise, it will display the shared email.

Valentin Castravet
Work: Zander ERP Services
Blog: Dynamics 365 Business Central Insights
LinkedIn: www.linkedin.com/in/valentin-c-0500a247/

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Ramesh Kumar 7,561 Super User 2026 Season 1 on at

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Agree with Valentin. Can you please double check with user has access to send on behalf of shared mail box. This is the common issue with shared email box.

Thanks!

Ramesh

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