ZyXEL Communications 200 Series User Manual
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Chapter 33 Anti-Spam
ZyWALL USG 100/200 Series User’s Guide
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Use this screen to configure an anti-spam black list entry to identify spam e-mail. You can
create entries based on specific subject text, or the sender’s or relay’s IP address or e-mail
address. You can also create entries that check for particular header fields and values.
Figure 425 Anti-X > Anti-Spam > Black/White List > Black List (or White List) > Add
The following table describes the labels in this screen.
Table 180 Anti-X > Anti-Spam > Black/White List > Black List (or White List) > Add
LABEL
DESCRIPTION
Enable Rule
Select this to have the ZyWALL use this entry as part of the black or white list.
To actually use the entry, you must also turn on the use of the list in the
corresponding list screen, enable the anti-spam feature in the anti-spam general
screen, and configure an anti-spam policy to use the list.
Type
Use this field to base the entry on the e-mail’s subject, source or relay IP address,
source e-mail address, or header.
Select Subject to have the ZyWALL check e-mail for specific content in the subject
line.
Select IP Address to have the ZyWALL check e-mail for a specific source or relay
IP address.
Select E-Mail Address to have the ZyWALL check e-mail for a specific source e-
mail address or domain name.
Select Mail Header to have the ZyWALL check e-mail for specific header fields
and values. Configure black list header entries to check for e-mail from bulk mail
programs or with content commonly used in spam. Configure white list header
entries to allow certain header values that identify the e-mail as being from a
trusted source.
Mail Subject
Keyword
This field displays when you select the Subject type. Enter up to 63 ASCII
characters of text to check for in e-mail headers. Spaces are not allowed, although
you could substitute a question mark (?). See
for more
details.
Sender or Mail
Relay IP Address
This field displays when you select the IP type. Enter an IP address in dotted
decimal notation.
Netmask
This field displays when you select the IP type. Enter the subnet mask here, if
applicable.
Sender E-Mail
Address
This field displays when you select the E-Mail type. Enter a keyword (up to 63
ASCII characters). See
Mail Header Field
Name
This field displays when you select the Mail Header type.
Type the name part of an e-mail header (the part that comes before the colon).
Use up to 63 ASCII characters.
For example, if you want the entry to check the “Received:” header for a specific
mail server’s domain, enter “Received” here.
Field Value
Keyword
This field displays when you select the Mail Header type.
Type the value part of an e-mail header (the part that comes after the colon). Use
up to 63 ASCII characters.
For example, if you want the entry to check the “Received:” header for a specific
mail server’s domain, enter the mail server’s domain here.
See