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"An error occurred in sending email for the mailbox" when you test and enable a mailbox in Dynamics 365

  • Článek

This article provides a solution to an error that occurs when you try to test and enable a mailbox in Microsoft Dynamics 365.

Applies to:   Microsoft Dynamics 365
Original KB number:   4092737

Symptoms

When you try to test and enable a mailbox in Dynamics 365, you receive the following error:

An error occurred in sending email for the mailbox <Mailbox Name> "Your mailbox is now connected to Dynamics 365" while connecting to the email server. The owner of the associated email server profile <Mailbox Name> has been notified. The system will try to send email again later.
Email Server Error Code: Web server returned ConnectFailure exception.

Cause

This error can occur if Dynamics 365 can't connect to your email server.

Cause 1: Firewall doesn't allow communication from Dynamics 365 online

If you use Dynamics 365 online with Exchange on-premises, it can occur if your firewall doesn't allow communication from Dynamics 365 online.

To solve this issue, verify your firewall allows communication from Dynamics 365 online. For a list of the IP address ranges that might be used by Dynamics 365, see Microsoft Dynamics 365 online IP Address Ranges.

Cause 2: Port values are incorrect

If you use an SMTP/POP3 provider such as Gmail, it can occur if the port values within the Advanced section of the email server profile aren't correct.

To solve this issue, verify the correct ports are specified:

Note

To manage security roles and mailbox settings, you need to sign in to your Dynamics 365 organization as a user with the "System Administrator" role.

  1. In Dynamics 365, navigate to Settings > Email Configuration > Email Server Profiles.

  2. Open the email server profile used by the mailbox that received the error.

    Note

    You can also select the name of the email server profile within the error message. It appears as a hyperlink that will open the correct email server profile record.

  3. Select Advanced.

  4. Verify the Incoming Port and Outgoing Port values, and then select Save.

    Note

    Refer to the documentation from your email provider for the correct ports to use when connecting to the SMTP service. For Gmail, the incoming POP3 port is 995, and the outgoing SMTP port is 587.

  5. Select Mailboxes, and then select the mailbox that received the error.

  6. Select the Test & Enable Mailboxes button to test again.

  7. After the test completes, open the mailbox record and view the Alerts if the results don't appear as Success.