Barracuda Networks 4 Installationsanleitung PDF herunterladen (Seite 31)

Setup 31

Step 8. Route Incoming Email to the Barracuda Spam Firewall

The next step in setting up your Barracuda Spam Firewall is to route incoming e-mail to the system

so it can scan incoming messages for spam and viruses. You can use either of the following methods

to route messages to your Barracuda Spam Firewall:

• Port forwarding (used when your Barracuda Spam Firewall is behind a corporate firewall)

• MX records (used when your Barracuda Spam Firewall in the DMZ)

After you route incoming e-mail to the Barracuda Spam Firewall, it will start filtering all e-mails it

receives and route the good e-mail to your e-mail server.

Port Forwarding

When your Barracuda Spam Firewall is behind a corporate firewall, you need to do a port redirection

(also called port forwarding) of incoming SMTP traffic (port 25) to the Barracuda Spam Firewall.

For more information about port forwarding, refer to your firewall documentation or administrator.

MX Records

If your Barracuda Spam Firewall is in the DMZ (not protected by your corporate firewall), do the

following to route incoming messages to the system:

1. Create a DNS entry for your Barracuda Spam Firewall.

The following example shows a DNS entry for a Barracuda Spam Firewall with a name of

barracuda and an IP address of 66.233.233.88:

barracuda.yournetwork.comIN A66.233.233.88

2. Change your DNS MX Records.

The following example shows the associated MX record with a priority number of 10:

IN MX 10barracuda.yournetwork.com

Step 9. Tune the Default Spam Settings

After you install the Barracuda Spam Firewall, the system begins filtering incoming e-mail based on

the default settings. For example, the unit automatically checks incoming e-mail for viruses and uses

the Barracuda blacklist service to identify spam.

Initially, your Barracuda Spam Firewall is configured to tag most spam by adding the word “[BULK]”

to the subject line of messages. Once you have more experience with the Barracuda Spam Firewall

you can adjust how aggressively the system deals with spam. For example, you may decide to

quarantine spam instead of blocking it.

Note

Do not try to route outgoing e-mail through the Barracuda Spam Firewall unless you have

configured the Relay operation or are using the Barracuda Spam Firewall in outbound mode.

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Barracuda Networks 4 Installationsanleitung Seite 31