Netgear STM150 ProSecure Web and Email Threat Management Appliance Reference Manual

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Email Content Filtering

The STM provides several options to filter unwanted content from emails. You can filter 
content from emails based on keywords in the subject line, file type of the attachment, and file 
name of the attachment. You can also set an action to perform on emails with 
password-protected attachments.

Several types of email blocking are available:

Keyword blocking. You can specify words that, should they appear in the email subject 

line, cause that email to be blocked by the STM.

Password-protected attachments. You can block emails based on password-protected 
attachments such as .zip or .rar attachments.

File extension blocking. You can block emails based on the extensions of attached files. 

Such files can include executable files, audio and video files, and compressed files.

File name blocking. You can block emails based on the names of attached files. Such 

names can include, for example, names of known malware threats such as the Netsky 
worm (which normally arrives as netsky.exe).

Subject

The default subject line for the notification email is “Malware detected!” You can 
change this subject line.

Message

The warning message informs the sender, the recipient, or both about the name of 
the malware threat. You can change the default message to include more 
information.

Make sure that you keep the %VIRUSINFO% metaword in a message to enable 
the STM to insert the correct malware threat information. In addition to the 
%VIRUSINFO% metaword, you can insert the following metawords in your 
customized message: %TIME%, %PROTOCOL%, %FROM%, %TO%, 
%SUBJECT%, %FILENAME%, %ACTION%, %VIRUSNAME%.