NETGEAR UTM5-100NAS, UTM50-100NAS manual Protecting Against E-mail Spam, Filter by File Name

ProSecure Unified Threat Management (UTM) Appliance Reference Manual

Table 6-3. E-mail Filter Settings (continued)

Setting

Description (or Subfield and Description)

Filter by File Type

File	By default, the File Extension field lists the most common file extensions. You can
Extension	manually add or delete extensions. Use commas to separate different extensions. You can
	enter a maximum of 40 file extensions; the maximum total length of this field, excluding the
	delimiter commas, is 160 characters.
	You can also use the pull-down menu to add predefined file extensions from a specific
	category to the File Extension field:
	• None. No file extensions are added to the File Extension field. This is the default setting.
	• Executables. Executable file extensions (exe, com, dll, so, lib, scr, bat, and cmd) are
	added to the File Extension field.
	• Audio/Video. Audio and video file extensions (wav, mp3, avi, rm, rmvb, wma, wmv,
	mpg, mp4, and aac) are added to the File Extension field.
	• Compressed Files. Compressed file extensions (zip, rar, gz, tar, and bz2) added to the
	File Extension field.
Action	SMTP	From the pull-down menu, specify an action when an e-mail attachment with a
	POP3	file extension that is defined in the File Extension field is detected. The pull-down
		menu selections and defaults are the same as the ones for the “Filter by
	IMAP
		Password-Protected Attachments (ZIP, RAR, etc.)” section above.
Filter by File Name
File Name	Enter the file names that are detected. Use commas to separate multiple file names. For
	example, to block the Netsky worm (which normally arrives as netsky.exe), enter
	netsky.exe.
Action	SMTP	From the pull-down menu, specify an action when an e-mail attachment with a
	POP3	name that is defined in the File Name field is detected. The pull-down menu
		selections and defaults are the same as the ones for the “Filter by Password-
	IMAP
		Protected Attachments (ZIP, RAR, etc.)” section above.

3.Click Apply to save your settings.

Protecting Against E-mail Spam

The UTM integrates multiple anti-spam technologies to provide comprehensive protection against unwanted e-mail. You can enable all or a combination of these anti-spam technologies. The UTM implements these spam prevention technologies in the following order:

1.Whitelist. E-mails from the specified sources or to the specified recipients are not considered spam and are accepted.

2.Blacklist. E-mails from the specified sources are considered spam and are blocked.

Content Filtering and Optimizing Scans 6-11

v1.0, January 2010