PRECIO

How Spam Scoring Works

Monitoring Inbound and Outbound Email Traffic Performance and Email Statistics

Virus Checking and Notifications

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Virus scanning is automatically enabled on the Barracuda Spam Firewall and the system checks for definition updates on a regular basis (hourly by default). Virus Scanning takes precedence over all other mail scanning techniques and is applied even when mail passes through the Connection Management layers. As such, even email coming from “whitelisted” IP addresses, sender domains, sender email addresses or recipients are scanned for viruses and blocked if a virus is detected.

Use the BASIC > Virus Checking page in the web interface to enable or disable virus checking. If you enable Barracuda Real-Time Protection, the Barracuda Spam Firewall will check unrecognized spam and virus fingerprints against the latest virus threats logged at Barracuda Central that have not yet been downloaded by the Barracuda Spam Firewall Energize Updates. See the online help on the BASIC > Virus Checking page for more details about this setting.

Extended Malware Protection (Available on model 600 and higher)

With version 6.1 and higher, Barracuda offers a subscription to provide additional anti-malware scanning with the Avira virus scan engine. To subscribe, see the Subscription Status section of the BASIC > Status page.

Internal Virus Scanning For Your Microsoft Exchange Mail Server

The Barracuda Spam Firewall offers an add-in that you can download from the web interface and install on your Microsoft Exchange Server to provide internal virus scanning within your network. The Barracuda Exchange Antivirus Agent runs as a Windows service on your 2003, 2007 or 2010 MS Exchange Server and works together with MS Exchange to scan internal mail traffic for viruses. Scanning is based on constantly updated virus signatures from the Barracuda Spam Firewall.

Any time a new virus signature is released, the Barracuda Exchange Antivirus Agent will scan all internal mail traffic for that virus as well as mail previously stored on the server, depending on how you configure settings for the agent. See the ADVANCED > Exchange Antivirus page on the Barracuda Spam Firewall web interface or see How to Get and Configure the Barracuda Exchange Antivirus Agent for instructions on

downloading and configuring the add-in for your organization’s needs.

Attachment Block Notifications

You can enable or disable notification emails to senders of messages that are blocked due to file attachment content filters. Configure these notifications for inbound and outbound mail from the ADVANCED > Bounce/NDR Settings page in the web interface. From this page you can also enter custom message text to insert in the notifications. Attachment content filters are configured in the Attachment Content Filters section of the BLOCK/ACCEPT > Content Filters page.

Spam and Quarantine Notifications

Separate non-delivery notifications (NDR) can be configured to alert the sender when a message is blocked or quarantined due to spam scoring or policy (content filtering). See Non-Delivery Reports (NDRs) for more information.

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This article refers to firmware 5.1 and higher. Before installing the Barracuda Exchange Antivirus Agent, it is recommended that you review all settings and options as shown below in Exchange Antivirus Settings. The Barracuda Exchange Antivirus Agent supports Microsoft Exchange Server versions 2003, 2007 and 2010.

What is the Barracuda Exchange Antivirus Agent?

The Barracuda Exchange Antivirus Agent is an add-in that you can download from your Barracuda Spam Firewall and install on your Microsoft Exchange mailbox server(s). The add-in works together with Microsoft Exchange Server to scan messages for viruses and only provides data about infected messages that is made available by the MS Exchange Server. The Barracuda Exchange Antivirus Agent provides constantly updated virus signatures and does the scanning. MS Exchange does not provide a quarantine tool for viewing infected messages, information on false positives or other infected message details. All threat statistics provided to the Barracuda Exchange Antivirus Agent by MS Exchange are listed in the Exchange Antivirus Add-in Statistics section on the ADVANCED > Exchange Antivirus page of the Barracuda Spam Firewall web interface. For infected file name information, see the MS Windows Event Log. To view performance of virus scanning on your MS Exchange server, use the MS Windows Performance Monitor.

Download and Install the Agent

Log into your Microsoft Exchange Server as an administrator.

From your MS Exchange Server, browse with Internet Explorer to the URI for your Barracuda Spam Firewall, log in, and then navigate to the ADVANCED > Exchange Antivirus page.

Click the Download button to get the add-in for your MS Exchange version. When prompted, indicate where to save the MSI file on your MS Exchange server.

Run the file. Follow the setup wizard instructions.

Click the Finish button when the wizard is finished. The Barracuda Exchange Antivirus Agent is now installed; however, it is not active and does not provide virus protection until after configuration is complete, per the following steps.

Configure the Agent on Microsoft Exchange

Note that if the configuration process is interrupted and does not complete, it can be rerun from the Start Menu, or it will reopen each time Windows is restarted until configuration is completed (or the product is uninstalled).

When prompted on MS Exchange, enter the URI (must be https) of your Barracuda Spam Firewall, along with the Passtoken shown on the ADVANCED > Exchange Antivirus page in the Exchange Antivirus Agent section.

Click Next. The Virus Definitions will now be installed on your MS Exchange server by the Barracuda Spam Firewall.

Click Next when the progress bar shows complete. The Barracuda Spam Firewall will install the configuration on your MS Exchange Server.

Click Finish when the progress bar shows complete. The Barracuda Exchange Antivirus Agent is now configured. At this point, the Barracuda Exchange Antivirus Agent has been loaded by the MS Exchange Server and scanning has begun according to the configured settings.

Exchange Antivirus Settings

After you have installed and configured the Barracuda Exchange Antivirus Agent per the above steps, you'll see your MS Exchange Server listed in the table in the Exchange Antivirus Settings section of the ADVANCED > Exchange Antivirus page on the Barracuda Spam Firewall listing the following:

Hostname - The hostname of your MS Exchange Server.

Version - The version of the installed Barracuda Exchange Antivirus Agent.

Updated - A value of Yes indicates that the Barracuda Exchange Antivirus Agent is communicating with the Barracuda Spam Firewall. If this field shows No, it might indicate a brief period of non-communication. Typically the field will refresh to Yes as the Barracuda Spam Firewall sends the Barracuda Exchange Antivirus Agent an update. If the value remains No, check network connectivity between your MS Exchange Server and the Barracuda Spam Firewall.

Barracuda Networks considers that the default configuration settings, managed from the ADVANCED > Exchange Antivirus page of the Barracuda Spam Firewall, are acceptable for most environments and recommends that they only be changed with caution. Please see the online help for details about each option and recommended settings.

Removing the Barracuda Exchange Antivirus Agent

To remove the Barracuda Exchange Antivirus Agent for a particular MS Exchange server, you must first uninstall the add-in from that MS Exchange Server. Next, log into the Barracuda Spam Firewall web interface as admin. From the ADVANCED > Exchange Antivirus page, click the trash can icon for the MS Exchange Server hostname in the table in the Exchange Antivirus Agent Settings section. This will remove the

MS Exchange Server from the statistics and threats reports on the page.