The Standard deployment configuration consists of a single email server and a single Barracuda Spam Firewall-Outbound Mode. Simply connect the Barracuda Spam Firewall-Outbound Mode to your network by assigning it a new IP address and changing your mail server's MTA to point to the Barracuda Spam Firewall-Outbound Mode. Alternatively, you may block all outbound port 25 traffic on your firewall to only allow traffic from the Barracuda Spam Firewall-Outbound Mode.
The Barracuda Spam Firewall-Outbound Mode can also support multiple email servers and multiple domains and may be used in environments where there are multiple email server locations. We recommend a Barracuda Spam Firewall-Outbound Mode for each location that contains an email server.
