The SonicWALL Anti-Virus E-Mail Filter allows the administrator to selectively delete or disable inbound E-mail attachments as they pass through the SonicWALL. This feature provides control over executable files and scripts, and applications sent as E-Mail attachments. SonicWALL Anti-Virus E-Mail Filter is included as part of the SonicWALL Network Anti-Virus subscription.
Tip! For more information on SonicWALL E-Mail Filtering Service, please visit www.sonicwall.com/products/antivirus.html
If you don't have SonicWALL E-Mail Filtering Service activated on your SonicWALL,
the Security Services>E-Mail Filter page displays E-Mail Filter Upgrade
information and links to activate or get a FREE trial of the E-Mail Filtering
Service subscription. If you have an active E-Mail Filtering Service subscription,
Security Services>E-Mail Filter page displays the settings for configuring the service.
Click the Activate your SonicWALL E-Mail Filtering Subscription link. Enter your mySonicWALL.com account username and password in the Username and Password fields, then click Submit. The System>Licenses page is displayed. Click Activate in the Network Anti-Virus row of the Manage Services Online table. Type the Activation Key located on the back of the Anti-Virus manual in the New License Key field(s) and click Submit.
You can try out a free trial version of SonicWALL E-Mail Filtering Service by clicking FREE TRIAL. Enter your mySonicWALL.com account username and password in the Username and Password fields, then click Submit. The System>Licenses page appears. Click the Click here link in the Free Trial column of the Manage Services Online table for Network Anti-Virus. The SonicWALL Network Anti-Virus page explains the terms of the free trial offer. Click Continue. The Network Anti-Virus Trial License is activated on your SonicWALL.
The E-mail Attachment Filtering section configures the file extensions that are filtered by the SonicWALL.
Enable Rapid E-Mail Attachment Filtering - Select this feature to automatically block the most prevalent e-mail viruses on the current Rapid E-mail Attachment Block List.
Enable E-Mail Attachment Filtering of Forbidden File Extensions -Select this check box to filter E-mail attachments entered into the Forbidden File Extensions list.
Forbidden File Extensions - Hackers commonly spread viruses through Visual Basic and Windows Executable files, therefore "vbs" and "exe" are provided as default extensions for this feature. To add a file extension to the list, click Add, and then type the file extension in the File Extension field and click OK. To edit a file extension, select the file extension and click Edit. To delete a file extension, select the file extension from the list, and click Delete. Click Delete All to delete all filename extensions in the Forbidden File Extensions table.
In this section, the administrator chooses the action that the SonicWALL performs when filtering E-mail attachments. The attached file can either be deleted or it can be disabled by altering the file extension. In either case, the warning text is sent to the intended recipient.
Disable Forbidden File by altering the file extension and attach warning text - Select this option to disable forbidden attachment files as they pass through the SonicWALL. The SonicWALL replaces the third character of file extensions with "_". If the E-mail attachment is a valid file, the E-mail recipient may return the attachment to its original file extension without damaging the file. The warning text from the Warning Message Text field is displayed to the user.
Delete Forbidden File and attach warning text - Select this option to delete forbidden attachment files as they pass through the SonicWALL. The warning text from the Warning Message Text field is displayed to the user.
This is a warning message that can be customized and added to e-mails filtered
by the Network Anti-Virus E-mail Filter. The default warning message
The attachment to your E-mail has been disabled by the SonicWALL Virus Filter. See your network administrator for details.
You can enter your own custom warning message up to 256 alphanumeric characters in the Warning Message Text box.
Select Block SMTP E-Mail Fragments (Content-Type: message\partial) to enable blocking of partial e-mail messages. E-mail fragments are e-mail messages with the MIME Content-Type: message/partial in the header. Partial e-mails can be a security threat by allowing viruses to escape undetected by virus scanners because they are fragmented. The virus becomes fully functional once reassembled on the client.
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