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Circular reference detected for domain 'smtp.castle-it.net'.
Terms
include:
smtp.castle-it.net
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 include:smtp.castle-it.net ~all
Circular reference detected