Sender Policy Framework System (Linux)

To set up support for Sender Policy Framework on your Linux-based server:

  1. Go to Tools & Settings > Mail Server Settings (in the Mail group). The server-wide mail preferences screen will open on the Settings tab.
  2. Select the Switch on SPF spam protection checkbox and specify whether you want SPF to continue checking if a DNS lookup fails.
  3. Specify how to deal with email when SPF applies local and guess rules:
  4. To specify additional rules that are applied by the spam filter before the SPF check is actually done by the mail server, type the rules you need in the SPF local rules box.

    For more information on SPF rules, visit http://tools.ietf.org/html/rfc4408.

  5. To specify the rules that are applied to domains that do not publish SPF records, type the rules into the SPF guess rules box.

    For example: v=spf1 +a/24 +mx/24 +ptr ?all

  6. To specify an arbitrary error notice that is returned to the SMTP sender when a message is rejected, type it into the SPF explanation text box.

    If no value is specified, the default text will be used as a notification.

  7. To complete the setup, click OK.