Zyxel ZyWALL 1100 [530/829] Overview

Zyxel USG 1900 [530/829] Overview
ZyWALL/USG Series User’s Guide
530
CHAPTER 32
Anti-Spam
32.1 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/USG
can also check e-mail against a DNS black list (DNSBL) of IP addresses of servers that are
suspected of being used by spammers.
32.1.1 What You Can Do in this Chapter
•Use the GeneralProfile screens (Section 32.3 on page 532) to turn anti-spam on or off and
manage anti-spam policies.
•Use the Mail Scan screen (Section 32.4 on page 535) to enable and configure the mail scan
functions.
•Use the Black/White List screens (Section 32.5 on page 537) to set up a black list to identify
spam and a white list to identify legitimate e-mail.
•Use the DNSBL screens (Section 32.7 on page 542) to have the ZyWALL/USG check e-mail
against DNS Black Lists.
32.1.2 What You Need to Know
White List
Configure white list entries to identify legitimate e-mail. The white list entries have the ZyWALL/
USG classify any e-mail that is from a specified sender or uses a specified header field and header
value as being legitimate (see E-mail Headers on page 531 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/USG 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/USG’s anti-spam speed and efficiency by not having the
ZyWALL/USG perform the full anti-spam checking process on legitimate e-mail.
Black List
Configure black list entries to identify spam. The black list entries have the ZyWALL/USG classify
any e-mail that is from or forwarded by a specified IP address or uses a specified header field and
header value as being spam. If an e-mail does not match any of the white list entries, the ZyWALL/
USG checks it against the black list entries. The ZyWALL/USG classifies an e-mail that matches a
black list entry as spam and immediately takes the configured action for dealing with spam. If an e-
mail matches a blacklist entry, the ZyWALL/USG does not perform any more anti-spam checking on

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