Anti-Spam; Chapter 35 Anti-Spam; Overview; What You Can Do In The Anti-Spam Screens - ZyXEL Communications ZyWALL USG 300 User Manual

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H A P T E R

35.1 Overview

The anti-spam feature can mark or discard spam (unsolicited commercial or junk
e-mail). Use the white list to identify legitimate e-mail. Use the black list to
identify spam e-mail. The ZyWALL can also check e-mail against a DNS black list
(DNSBL) of IP addresses of servers that are suspected of being used by
spammers.

35.1.1 What You Can Do in the Anti-Spam Screens

• Use the General screens
and manage anti-spam policies.
• Use the Black/White List screens
list to identify spam and a white list to identify legitimate e-mail.
• Use the DNSBL screens
e-mail against DNS Black Lists.
• Use the Status screen
sessions the ZyWALL is currently checking and DNSBL statistics.

35.1.2 What You Need to Know About Anti-Spam

White list
Configure white list entries to identify legitimate e-mail. The white list entries
have the ZyWALL classify any e-mail that is from a specified sender or uses a
specified header field and header value as being legitimate (see
page 600 for more on mail headers). The anti-spam feature checks an e-mail
against the white list entries before doing any other anti-spam checking. If the e-
mail matches a white list entry, the ZyWALL classifies the e-mail as legitimate and
does not perform any more anti-spam checking on that individual e-mail. A
properly configured white list helps keep important e-mail from being incorrectly
classified as spam. The white list can also increases the ZyWALL's anti-spam
speed and efficiency by not having the ZyWALL perform the full anti-spam
checking process on legitimate e-mail.
ZyWALL USG 300 User's Guide
(Section 35.3 on page
(Section 35.4 on page
(Section 35.6 on page
(Section 35.6 on page 610) to see how many mail
35

Anti-Spam

601) to turn anti-spam on or off
605) to set up a black
610) to have the ZyWALL check
E-mail Headers on
599