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DMARC has good intentions, but it is human behavior that needs to be addressed and protected against. In today's business world, IT admins need to be more proactive, than reactive. Though DMARC has a lot of proactive traits, more is needed, including proper training and especially, ongoing monitoring.
A great company I ran across not too long ago has a very good anti-phishing service; you may want to check out this review and the service: Review of Phishme
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