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The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
Terms
include:
spf.global.frontbridge.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
-all
fail
the email's SPF check.
Included records
v=spf1 include:spf.global.frontbridge.com -all
ptr:protection.outlook.com ptr:messaging.microsoft.com ptr:o365filtering.com -all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable