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Troubleshoot Exchange Server Error 451 4.4.0

The Exchange server error 4514.4.0 problem occurs due to the following two reasons.

  • Sending emails to specific remote domains
  • Sending emails to all remote domains

Scenario 1

If the Exchange server error 4514.4.0 problem occurs when you send emails to specific remote domains, refer to the step-by-step guidelines provided below.

  • Go to the MX Record lookup tool to check the IP address of the affected remote domain’s MX record, i.e., mail server.
  • You have to create a new send connector for the affected domain as per the steps given here.
  • Launch the New Send Connector window and select the Address Space option on the left panel.
  • Choose the affected remote domain from the list. If the affected remote domain is not available in the list, click the Add icon and add the affected remote domain.
  • After you click the Network Setting option on the left panel, select the radio button next to the ‘Route mail through the following smart host’ option.
  • Click the Add icon, select the radio button beside the IP Address option, and enter the IP address of the MX record.
  • Click the OK -> Network Settings -> Configure smart host authentication settings on the left panel.
  • Select the radio button next to the None option and click the Next option.
  • For the rest of the settings, use the default value. Check if the Exchange server error 4514.4.0 problem has been resolved.

Scenario 2

If the Exchange server error 4514.4.0 problem occurs at the time of sending an email to all remote domains, carry out the solution given here.

  • Launch the Properties window of the Exchange server.
  • Click the External DNS Lookups tab, select the radio button beside the Use these DNS servers option, and type the IP address of the public DNS server.
  • After clicking the OK option, select the checkbox beside the ‘Use the External DNS Lookup settings on the transport server’ option.
  • Finally, save this setting by clicking the OK button and close the Properties window.
  • If the Exchange server error 4514.4.0 problem persists, click the Call button available on our web page.
  • Our support members will provide technical assistance in resolving the Exchange server error 4514.4.0 problem.
Troubleshoot Exchange Server Error 451 4.4.0