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The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
Terms
ptr:
.
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
include:
itahost.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
soft fail
the email's SPF check.
Included records
v=spf1 ptr include:itahost.com ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
mx ~all