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Why is mail not being delivered from my Email Security Gateway to my mail server after upgrading from firmware version or below to a version newer than

  • Type: Knowledgebase
  • Date changed: 3 years ago
Solution #00002647

All Email Security Gateways upgrading from firmware version or below to a version newer than

If you are using hostnames rather than IP addresses to specify your destination mail servers (configured under the Domains tab of the Email Security Gateway's web interface), upgrading to a version newer than may interrupt mail delivery.

Firmware version introduced DNS caching on the Email Security Gateway. While this decreases load on your DNS servers, it may use external DNS servers to resolve internal hostnames. To remedy this problem, go to the Basic > IP Configuration page, scroll down to the DNS server configuration area, make sure an internal DNS server is listed, and specify the Use Only These Servers option as Yes. This will ensure the Email Security Gateway does not look to any other DNS servers to resolve your internal hostnames. All mail messages in the outbound queue should begin to deliver themselves to your mail server immediately after making this change; please allow 15 minutes for all of the messages to be delivered.

If you encounter any further issues, please contact Barracuda Networks Technical Support.

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