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The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 ptr:protection.outlook.com ptr:messaging.microsoft.com ptr:o365filtering.com -all
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PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
ptr:
o365filtering.com
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
-all
fail
the email's SPF check.
Included records
v=spf1 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