That it is SPF Record
SPF is a protection against the falsification of directions in the e-mail shipment. It identifies, through the registries of domain names, to the servers of authorized mail smtp for the transport of the messages
How to validate your registry SPF?
To form correct registry SPF is an essential part of its configuration for the correct operation of his emails.
This page explains how to verify and to validate if it has formed correctly registry SPF I have identifies faults in your present configuration