Zyxel-communications 5 Series Bedienungsanleitung PDF herunterladen (Seite 289)

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ZyWALL 5/35/70 Series User’s Guide

Chapter 15 Anti-Spam 289

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-SPAM to open the Anti-Spam 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.

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