What is SPF in email security?

Related questions

1. What is SPF error?
2. What is my SPF record?
3. How do I enable or add SPF records?
4. Why SPF record is important?
5. What is SPF failure?
6. What is SPF TempError?
7. Can you have two SPF TXT records?
8. What is SPF Dkim dmarc?
9. How long can an SPF record be?
10. What is SPF all?

Tags

1. #deeper
2. #state
3. #publicly
4. #servers
5. #picture
6. #which
7. #enables
8. #policy
9. #framework
10. #understand
11. #bigger
12. #domain
13. #order
14. #standards
15. #every
16. #detail
17. #sender
18. #those
19. #knowledge
20. #emails
21. #behalf