Sender Policy Framework (SPF) is an open standard which provides solutions to resist sender address forgery. Organizations who want to adopt SPF are required to publish DNS records for the hosts that are used in "MAIL FROM" and "HELO" identities so that recipients can identify whether a host is authorized to send email messages for the domain by querying these records. The complete specifications of SPF are documented in RFC 4408.
Need More Help?
Create a technical support case if you need further support.
Sender Policy Framework (SPF) configuration in InterScan Messaging Security Virtual Appliance
Thank you for your feedback!