ZyXEL ZyWALL 5 User Guide - Page 315
SpamBulk Engine, Spam Threshold, SMTP and POP3, Finding Out More, Phishing
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Chapter 16 Anti-Spam Screens SpamBulk Engine The e-mail fingerprint ID that the ZyWALL generates and sends to the anti-spam external database only includes the parts of the e-mail that are the most difficult for spammers (senders of spam) to change or fake. The anti-spam external database maintains a database of e-mail fingerprint IDs. The anti-spam external database SpamBulk engine then queries the database in analyzing later e-mails. The SpamBulk Engine also uses Bayesian statistical analysis to detect whether an e-mail is fundamentally the same as a known spam message in spite of a spammer's attempt to disguise it. Spam Threshold You can configure the threshold for what spam score is classified as spam. The ZyWALL considers any e-mail with a spam score higher than the spam threshold to be spam. Any e-mail with a score less than or equal to the spam threshold is treated as legitimate. SMTP and POP3 Simple Mail Transfer Protocol (SMTP) is the Internet's message transport standard. It controls the sending of e-mail messages between servers. E-mail clients (also called e-mail applications) then use mail server protocols such as POP (Post Office Protocol) or IMAP (Internet Message Access Protocol) to retrieve e-mail. E-mail clients also generally use SMTP to send messages to a mail server. The older POP2 requires SMTP for sending messages while the newer POP3 can be used with or without it. This is why many e-mail applications require you to specify both the SMTP server and the POP or IMAP server (even though they may actually be the same server). The ZyWALL's anti-spam feature checks SMTP (TCP port 25) and POP3 (TCP port 110) emails. The anti-spam feature does not check (or act upon) e-mails that use other protocols (such as IMAP) or other port numbers. Finding Out More See Section 16.6 on page 324 for more information on antispam. 16.2 The General Screen Use this screen to turn the anti-spam feature on or off, choose what traffic flows the ZyWALL checks for spam, and set how the ZyWALL treats spam. Phishing Phishing is a scam where fraudsters send e-mail claiming to be from a well-known enterprise in an attempt to steal private information. For example, the e-mail might appear to be from a bank, online payment service, or even a government agency. It generally tells you to click a link and update your identity information in order for the business or organization to verify your account. The link directs you to a phony website that mimics the business or organization's website. The fraudsters then use your personal information to pretend to be you and commit crimes like running up bills in your name (identity theft). ZyWALL 5/35/70 Series User's Guide 315