Connecting to a DNS to perform message authentication

To enable Mail Sender Authentication, you must allow Kaspersky Security 8 for Linux Mail Server to connect to the DNS server. If the connection to the DNS server is prohibited, SPF, DKIM, and DMARC Mail Sender Authentication is disabled.

You can also specify the maximum DNS server response wait time. When this time elapses, the DNS server is considered unavailable, and the message is processed by Kaspersky Security 8 for Linux Mail Server without message authentication. The default value is 10 seconds.

To allow Kaspersky Security 8 for Linux Mail Server to connect to the DNS server:

1. In the main window of the program web interface, open the management console tree and select the Settings section and Protection subsection.
2. In the External Services section, click the Allow connection to DNS server link to open the External Services window.
3. In the list on the right of the name of the Allow connection to DNS server setting, select Yes.
4. Click the Apply button.

To specify the maximum DNS server response wait time:

1. In the main window of the program web interface, open the management console tree and select the Settings section and Protection subsection.
2. In the External Services section, click the Allow connection to DNS server link to open the External Services window.
3. In the field to the right of the DNS server timeout setting, specify the maximum DNS server response wait time.

   The default value is 10 seconds.

4. Click the Apply button.