ZyXEL Communications ZyWALL5UTM 4.0 15.2 Anti-SpamGeneral Screen, 15.1.7 MIME Headers, General, SECURITY, ANTI-SPAM, Anti-Spam

ZyWALL 5/35/70 Series User’s Guide

15.1.7 MIME Headers

MIME (Multipurpose Internet Mail Extensions) allows varied media types to be used in e- mail. MIME headers describe an e-mail’s content encoding and type. For example, it may show which program generated the e-mail and what type of text is used in the e-mail body. Here are some examples of MIME headers:

•X-Priority: 3 (Normal)

•X-MSMail-Priority: Normal

•Content-Type: text/plain; charset="iso-8859-1"

•Content-Transfer-Encoding: base64

In an MIME header, the part that comes before the colon (:) is the header. The part that comes after the colon is the value. Spam often has blank header values or comments in them that are part of an attempt to bypass spam filters.

15.2 Anti-Spam General Screen

Click SECURITY, ANTI-SPAMto open the Anti-Spam General screen. Use this screen to turn the anti-spam feature on or off and set how the ZyWALL treats spam.

Figure 125 Anti-Spam: General

Chapter 15 Anti-Spam 266