DNS Black Lists (Server Level Options)

Server level DNS black lists are spam databases that store information about IP addresses that are known to send spam. IP addresses that have open mail relays (relays mail for anyone) are also commonly listed in black lists, because those servers have the potential to be easily hijacked by spammers. Each black list compares the IP addresses from which an email is sent against the spam database to look for a match. If a domain's IP address is listed in one of the black lists, mail from that domain should be suspected of being spam.

All black lists must be configured and enabled at the server level before an IMail email domain can use them. This lets a system administrator decide which black lists to allow an email domain to use. Only black lists that are enabled on the DNS Black Lists page are available for use in domain (host) level configurations.

Use DNS Black Lists Options to add, edit and delete server black lists. All black lists that are currently configured for the server are displayed in the DNS black list. The DNS black list information is stored in the spamblkm.txt file located in the IMail top directory.

Note: DNS black lists must be enabled at the server level before they are made available for use at the email domain level. DNS black lists are then used at the domain level (when bound to an IP address ), where administrators can choose which black lists to enable for the host on the Connection Checks page.

Save Logs To list. Lets you configure the logging options for the antispam components. Select from four logging options:
- No Log. Select this option to turn off event logging.
- spamMMDD.log. Select to send event information to a file of this name, where MM is the month and DD is the day the log was written. This file is stored in the Spool directory.
- App Log. Select to send information to the Windows Application Log (viewed with the Windows Event viewer).
- Log Server. Select to send event information to the Log file indicated on the Logging tab.

Verbose Logging. Select this option to record more information than standard logging, such as changes to antispam settings and entries in the trusted addresses list or exclude list. This option can create a very large file and may be resource intensive, however, it is especially helpful in troubleshooting issues.

Add. To add a new black list, or edit an existing one, click this button to navigate to the Add/Edit the Black List page.
Delete. To delete an existing black list from the list, select the check box next to the list and click the Delete button.
Important: Updates made to the DNS Black List will not successfully update until the "Save" button has been clicked.
Save. Click to save your settings. An "Update Successful" message and the time of the update appear.