What is Sender Policy Framework (SPF)?
Sender Policy Framework (SPF) is an anti-spam protocol that allows you to authenticate or verify the domain of an email sender. This protocol is useful in deterring spammers who often disguise their true Internet address by pretending that their email comes from a legitimate domain. Each domain that provides support for SPF has an entry in their Domain Name System (DNS) that describes unique attributes about their mail system and a list of authorized senders. A SPF client program or receiver, in this case –VUmailguard – sends a DNS query to the domain from which the email supposedly originated to determine if the sender is legitimate. When the SPF client program evaluates an SPF record, it produces one of several results or conditions, which are predefined by the SPF protocol and included as rules in the VUmailguard SPF feature. The results of the DNS query will determine if VUmailguard should accept the email.
