Troubleshooting email not sent from the internal Hub

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This topic provides guidance for diagnosing and resolving issues you may encounter with no incoming email from the internal Hub and Forefront TMG.

Flowchart for troubleshooting no email from internal Hub

This flowchart guides you through the steps that are required for troubleshooting when no email is received from the internal Hub.

No email received from internal Hub

Procedures for troubleshooting no email from internal Hub

Follow the procedures described in Troubleshooting no incoming email from web. The one difference is that you need to check the internal mail route (and not the external mail route).

How to check and configure the Internet (internal) mail route listener settings according to MX record

Check that the mail route listener is configured correctly on the internal NIC according to the MX record settings.

To check and configure the Internet (internal) mail route listener settings according to MX record:

  1. Check the mail exchanger (MX) resource record for your domain registered on the internal DNS server.

  2. Check that the mail route listener is configured correctly on the internal NIC according to the MX record settings:

    1. In the Forefront TMG Management console, in the tree, click E-Mail Policy node.

    2. Select Internal_Mail_Servers, and in the Tasks pane, click Edit Selected Route.

    3. On the Routing tab, check the Internal mail servers.

    4. On the Domains tab, check the accepted domains.

    5. On the Listener tab, check the FQDN or IP address….

  3. Telnet into the MX record IP from the internal network. Check that the response receives the FQDN defined in the SMTP route.