Learn how Sender Policy Framework helps prevent email spoofing.
SPF (Sender Policy Framework) is an email authentication standard that allows a domain owner to specify which mail servers are authorized to send email on behalf of their domain. When a receiving mail server gets a message, it checks the sender's SPF record to verify that the sending IP address is authorized.
This record authorizes Microsoft 365 to send email for the domain while rejecting all other senders.
| Result | Description |
|---|---|
| Pass | The sender is authorized. |
| Fail | The sender is not authorized. |
| SoftFail | Probably unauthorized. |
| Neutral | No opinion. |
| None | No SPF record found. |
Use our DNS Lookup tool to view SPF records for any domain.