ZyXEL ZyWALL ATP700 User Guide - Page 618
White List, Black List
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CHAPTER 31 Email Security 31.1 Overview The email security feature can mark or discard spam (unsolicited commercial or junk email). Use the white list to identify legitimate email. Use the black list to identify spam email. The Zyxel Device can also check email against a DNS black list (DNSBL) of IP addresses of servers that are suspected of being used by spammers. 31.1.1 What You Can Do in this Chapter • Use the Email Security screens (Section 31.3 on page 620) to turn email security on or off and manage email security policies. Also, you can enable and configure the mail scan functions and have the Zyxel Device check email against DNS Black Lists. • Use the Black/White List screens (Section 31.4 on page 622) to set up a black list to identify spam and a white list to identify legitimate email. 31.1.2 What You Need to Know White List Configure white list entries to identify legitimate email. The white list entries have the Zyxel Device classify any email that is from a specified sender or uses a specified header field and header value as being legitimate (see Email Headers for more on mail headers). The email security feature checks an email against the white list entries before doing any other email security checking. If the email matches a white list entry, the Zyxel Device classifies the email as legitimate and does not perform any more email security checking on that individual email. A properly configured white list helps keep important email from being incorrectly classified as spam. The white list can also increases the Zyxel Device's email security speed and efficiency by not having the Zyxel Device perform the full email security checking process on legitimate email. Black List Configure black list entries to identify spam. The black list entries have the Zyxel Device classify any email that is from or forwarded by a specified IP address or uses a specified header field and header value as being spam. If an email does not match any of the white list entries, the Zyxel Device checks it against the black list entries. The Zyxel Device classifies an email that matches a black list entry as spam and immediately takes the configured action for dealing with spam. If an email matches a blacklist entry, the Zyxel Device does not perform any more email security checking on that individual email. A properly configured black list helps catch spam email and increases the Zyxel Device's email security speed and efficiency. ZyWALL ATP Series User's Guide 618