Sender Policy Framework (SPF) What is it?
SPF (Sender Policy Framework)is an email verification protocol that allows the owners of a domain name to declare through DNS (Domain Name System) records which mail servers are authorized to send emails on behalf of that domain name.
To make a simple analogy; The SPF record is like the "Permitted Personnel List" that you give to your company's security officer. If the person who comes to the door (sending an email) is not on the list (SPF record), the security guard (receiving server) will not let that person in or will mark that person as suspicious.
Important Link:
SPF alone is not enough. For complete security of your e-mail infrastructure MX RecordsIt is also necessary to configure the . For detailed information MX Registration Guide Check out our page.