Instructions
2) Type nslookup and press Enter.
3) Type set type=txt and press Enter.
4) Type the name of the domain you wish to query and press Enter.
OUTCOME
If an SPF record exists for the domain you entered, it will be displayed in a manner similar to the following:
Type exit and press Enter to exit nslookup.
Close the Command Prompt window by clicking the X button in the upper-right corner or by typing exit and pressing Enter.