Email Don't have SPF record check,How can I use this feature？

Question

Hello, everyone. I am testing SFOS 17.1.4 mr-4, 
 There is SPF record check for email spoof prevention option in the help document, but I does not. How do I use it? 
 https://community.sophos.com/kb/en-us/133101 
 
 Thanks

LuCar Toni · Accepted Answer

SPF is a V17.5 Feature. 
 https://community.sophos.com/products/xg-firewall/b/xg-blog/posts/sfos-17-5-ga-released 
 Email Features 
 Sender Policy Framework (SPF) anti-spoofing protection and a new MTA based on Exim which closes a couple of top requested feature differences with SG Firewall is added.

Ben ni · Answer

SORRY，I just received a new update, this function is already available