DNS Black Lists (Server Level)

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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 e-mail 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 e-mail domain can use them. This lets a system administrator decide which black lists to allow an e-mail 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.

Important: Updates made to the DNS Black List will not successfully update until the "Save" button has been clicked, and the message "Your changes have been saved" is displayed at the top.

Save. Click to save your settings. An "Update Successful" message and the time of the update appear.

Related Topics

Server Level Antispam Options (Black Lists)

Understanding DNS Black Lists

How Black Lists Work

Adding a DNS Black List

Setting Connection Checks Options