How to create a 365 exchange rule for all users based on the header?

Jim Millerick 31 Reputation points

I go to the exchange admin center
select rules
Create a rule
If the sender is located outside the organization and the recipient is located inside the organization
prepend the message with external

That works

BUT if I try add another condition - such ahs the header includes spf=fail, the rule doesn't work I think it might be because of the header name - i've tried test, spffail and others but it doesn't work. I have no idea what the header name is or should be or if it is just a rose by another name.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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