ZyXEL Communications ZyWALL Series - 44.2.3 DNSBL Anti-Spam Commands

Chapter 44 Anti-Spam
ZyWALL Series CLI Reference Guide
407
44.2.2.1 White and Black Lists Example
This example shows how to configure and enable a white list entries for e-mails with “testwhite” in the
subject, e-mails from whitelist@ourcompany.com, e-mails with the Date header set to 2007, and e-mails
from (or forwarded by) IP address 192.168.1.0 with subnet 255.255.255.0.
44.2.2.2 Regular Expressions in Black or White List Entries
The following applies for a black or white list entry based on an e-mail subject, e-mail address, or e-mail
header value.
• Use a question mark (?) to let a single character vary. For example, use “a?c” (without the quotation
marks) to specify abc, acc and so on.
• You can also use a wildcard (*). For example, if you configure *def.com, any e-mail address that ends
in def.com matches. So “mail.def.com” matches.
• The wildcard can be anywhere in the text string and you can use more than one wildcard. You
cannot use two wildcards side by side, there must be other characters between them.
• The Zyxel Device checks the first header with the name you specified in the entry. So if the e-mail has
more than one “Received” header, the Zyxel Device checks the first one.
44.2.3 DNSBL Anti-Spam Commands
This section describes the commands for checking the sender and relay IP addresses in e-mail headers
against DNS (Domain Name Service)-based spam Black Lists (DNSBLs). You must use the
configure
terminal
command to enter the configuration mode before you can use these commands.
[no] anti-spam xheader {white-list |
black-list} mail-header mail-header-
value
Specifies the name and value for the X-Header to add
to e-mails that match the Zyxel Device’s spam white list
or black list.
show anti-spam xheader {white-list |
black-list}
Displays the name and value for the X-Header to add to
e-mails that match the Zyxel Device’s spam white list or
black list.
Table 217 Commands for Anti-Spam White and Black Lists (continued)
COMMAND DESCRIPTION
Router(config)# anti-spam white-list subject testwhite activate
Router(config)# anti-spam white-list e-mail whitelist@ourcompany.com
activate
Router(config)# anti-spam white-list mail-header Date 2007 activate
Router(config)# anti-spam white-list ip-address 192.168.1.0 255.255.255.0
activate
Router(config)# show anti-spam white-list
No. Type Status
Content
==========================================================================
1 subject yes
testwhite
2 e-mail yes
whitelist@ourcompany.com
3 mail-header yes
Date : 2007
4 ip-address yes
192.168.1.0 / 255.255.255.0