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How can I configure Microsoft Exchange 2007 to use my Barracuda Spam Firewall as an outbound relay?

  • Type: Knowledgebase
  • Date changed: 4 years ago
Solution #00003629

All Barracuda Spam Firewalls in use with a Microsoft Exchange 2007 server, all firmware versions.

***Barracuda Networks provides no guarantee that the instructions will work in your environment, and provides these instructions on the condition that the you use them your own risk.***

After configuring the Barracuda Spam Firewall to relay outgoing mail (make sure to do this first as described in Solution #00002087), you must configure your mail server to relay all outgoing mail through the Barracuda Spam Firewall. To do this on an Exchange 2007 server, you must create a "Send Connector" for either the Hub Transport server or Edge Transport server. To configure one, follow these steps:

  1. Open the Exchange Management Console.
  2. Navigate to Organization Configuration > Hub Transport > Send Connectors > New Send Connector.

  3. Name the Send Connector.
  4. Use the drop-down box and select Custom, and click Next.
  5. Click Add, select SMTP Address Space, enter the following, and click OK:
    • Address. Enter your domain name, like example.com. You can include the wildcard character (*) in the address space as defined by RFC 1035. For example, *, *.com, and *.example.com are permitted, but *example.com is not. If you entered an address space that contains the wildcard character, Include all subdomains will be automatically selected, but if you have not, select Include all subdomains (if desired).
    • Cost. Use the address space cost to set the selection priority when more than one Send Connector is configured for the same address space. During routing resolution, when the connector selection is made, the least cost routing path to the destination address space is selected. The default cost is set to 1. The valid input range is 1 to 100. If you're not sure what to put, just leave it at 1.
  6. When all of your domains have been entered, click Next.

  7. Select the Route mail through the following smart hosts option.
  8. Click Add, enter the IP address of the Barracuda Spam Firewall, and click OK.
  9. Do not specify any authentication settings. Click Next after the Barracuda Spam & Virus Firewall's IP Address has been entered.
  10. Click Add, enter the Source Server that should relay outgoing mail through the Barracuda Spam & Virus Firewall, and click OK. This Source Server must be either a Hub Transport server or Edge Transport server.
  11. Click Next, New, and then Finish.

If the Barracuda Spam & Virus Firewall has been configured for Outbound Relay, your outgoing mail should now go through the Barracuda Spam & Virus Firewall.

Additional Notes:

For more on Send Connectors and Microsoft Exchange 2007, click here:


For more information on configuration Edge Transport Connectors in Microsoft Exchange 2007, click here:


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