Security Services > E-Mail Filter

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

E-Mail Filter Upgrade

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, the
Security Services>E-Mail Filter
page displays the settings for configuring the service.

Activating E-Mail Filtering Upgrade

Click the Activate your SonicWALL E-Mail Filtering Subscription link. Enter your 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.

Free Trial of E-Mail Filtering Service

You can try out a free trial version of SonicWALL E-Mail Filtering Service by clicking FREE TRIAL. Enter your 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.

E-Mail Attachment Filtering

The E-mail Attachment Filtering section configures the file extensions that are filtered by the SonicWALL.

E-Mail Attachment Filtering Options

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.

Warning Message Text

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 is
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.

E-Mail Blocking

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.

Help Table of Contents