ZyXEL ZyWALL USG 2000 User Guide - Page 661
Configuration > Anti-X > Anti-Spam > DNSBL
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Chapter 38 Anti-Spam The following table describes the labels in this screen. Table 177 Configuration > Anti-X > Anti-Spam > DNSBL LABEL DESCRIPTION Show Advance Click this button to display a greater or lesser number of configuration Settings / Hide fields. Advance Settings Enable DNS Black Select this to have the ZyWALL check the sender and relay IP List (DNSBL) addresses in e-mail headers against the DNSBL servers maintained by Checking the DNSBL domains listed in the ZyWALL. DNSBL Spam Tag Enter a message or label (up to 15 ASCII characters) to add to the beginning of the mail subject of e-mails that have a sender or relay IP address in the header that matches a black list maintained by one of the DNSBL domains listed in the ZyWALL. This tag is only added if the anti-spam policy is configured to forward spam mail with a spam tag. Max. IPs Set the maximum number of sender and relay server IP addresses in Checking Per Mail the mail header to check against the DNSBL domain servers. IP Selection Per Mail Select first N IPs to have the ZyWALL start checking from the first IP address in the mail header. This is the IP of the sender or the first server that forwarded the mail. Query Timeout Setting SMTP Select last N IPs to have the ZyWALL start checking from the last IP address in the mail header. This is the IP of the last server that forwarded the mail. Select how the ZyWALL is to handle SMTP mail (mail going to an email server) if the queries to the DNSBL domains time out. Select drop to discard SMTP mail. Select forward to allow SMTP mail to go through. POP3 Select forward with tag to add a DNSBL timeout tag to the mail subject of an SMTP mail and send it. Select how the ZyWALL is to handle POP3 mail (mail coming to an email client) if the queries to the DNSBL domains time out. Select forward to allow POP3 mail to go through. Timeout Value Timeout Tag DNSBL Domain List Add Select forward with tag to add a DNSBL timeout tag to the mail subject of an POP3 mail and send it. Set how long the ZyWALL waits for a reply from the DNSBL domains listed below. If there is no reply before this time period expires, the ZyWALL takes the action defined in the relevant Actions when Query Timeout field. Enter a message or label (up to 15 ASCII characters) to add to the mail subject of e-mails that the ZyWALL forwards if queries to the DNSBL domains time out. Click this to create a new entry. ZyWALL USG 2000 User's Guide 661