Add/Edit the DNS Black List

How to get here

This page enables you to either edit an existing DNS black list or configure a new DNS black list.

Important: Fields cannot be left blank or contain spaces.

Name. Enter a name in the text box to identify a new black list. This can be any name that you want, and will be used in log lines to identify the black list entry.
Server. In the text box, enter the domain name or IP address of the DNS server to contact for black list queries. This field contains an asterisk (*) by default, which indicates that the default IMail Server DNS is used for black list queries, where it relays the DNS query to the DNS server for the black list. Using the asterisk eliminates the need to enter the IP address or domain.
Query Domain. In the text box, enter the domain to query in the zone file. This name usually matches the server domain name. However, sometimes a black list will contain multiple zones to query on the same server. When this happens, the server name and the query domain will be different. The only way to know this is to read the documentation for the black list being used.
Type. Select the type of lookup that the black list performs from the list box.
- ADDR (ADDRESS). This type of black list uses a message's "FROM" address to determine whether the message is spam.
- DNS. This type of black list checks the IP address of the connecting SMTP server against spam databases to determine whether the message is spam. If the IP address is listed in one of the black list's databases, the message is identified as spam.
- HELO. This type of black list checks the domain supplied in the HELO or EHLO command to determine whether to accept the message. The domain name that is given in the HELO/EHLO command must match the IP address.
- RHS (RIGHT-HAND SIDE). This type of black list checks the information following the @ symbol supplied in the "MAIL FROM" command to determine whether the message is spam.
Enable. Select the check box to enable the black list.
TCP/IP First. Some black lists, especially ones that supply .txt records, have packets that are too large to transmit via the UDP protocol. These lists disable UDP access and require TCP to query the black list. Select this check box to allow the administrator to flag a list as one of these types.
Add. Click this button to add the new black list. Your new black list appears on the DNS Black Lists page.
Cancel. Click this button to cancel adding a new black list. No new information should appear on the DNS Black Lists page.