office 365 mail SPF Fail but still delivered

Occasional Visitor


today i received mail from my organization. i check headers and see that spf failed.

Received-SPF: Fail ( domain of does not
designate as permitted sender);


why spffailed mails normally received? 


i check SPF at mxtoolbox and SPF is correctly configured.

1 Reply

Failing SPF will not cause Office 365 to drop a message, at best it will mark it as Junk, but even that wont happen in all scenarios.