This solution applies to all Barracuda Spam Firewalls.`
To take advantage of the filtering options on your Barracuda Spam Firewall, you must route all incoming email to the device.
There are two common options for routing email to the Barracuda Spam Firewall:
- Port Forwarding – Change the port forwarding settings on your
corporate firewall to route incoming email traffic to your Barracuda Spam Firewall. To do this you will need to modify the corporate firewall port
settings as required. For instructions,
see your firewall documentation or Network Administrator.
- MX Records – Create a DNS entry for your Barracuda Spam Firewall and change your DNS MX record to route incoming email to the Barracuda. Typically, this is done on your DNS server or through your DNS service.
barracuda.barracudanetworks.com IN A 220.127.116.11
Example Modified MX Record:
IN MX 10 barracuda.barracudanetworks.com
The Barracuda Spam Firewall will only filter SMTP traffic on port 25. If you have users using Webmail then that traffic should bypass the Barracuda Spam Firewall and sent directly to the mail server.
Although DNS services vary, your new DNS and MX entries should resemble the example above. The above example shows a modifier of 10 for illustration only.
Some DNS servers cache information for up to seven days, so it may take time for all your email to be routed to the new MX record.
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