SoftLayer_Dns_Domain_ResourceRecord_SpfType is a SoftLayer_Dns_Domain_ResourceRecord object whose type property is set to "spf" and defines a DNS SPF record on a SoftLayer hosted domain. An SPF record provides sender policy framework data for a host. For instance, if defining the SPF record "v=spf1 mx:mail.example.org ~all" for "host.example.org". then the host property equals "host" and the data property equals "v=spf1 mx:mail.example.org ~all".
SPF records are commonly used in email verification methods such as Sender Policy Framework.