DMARC What is it and why you should care

What is DMARC?

DMARC (Domain-based Message Authentication Reporting and Conformance) is an email validation system designed to protect your organization’s email domain from spoofing and phishing scams. It uses your existing email authentication protocols such as SPF (Sender Policy Framework) and DKIM (Domain Keys Identified Mail) to determine your email message’s authenticity. It adds an essential piece of functionality of reports back to the domain owner, who can then decide who is sending email on their behalf.

DMARC ISP adds a level of certainty on whether an email is legit

In a nutshell, DMARC adds a level of certainty on whether an email is legit and that it has originated from your domain and essentially acts like a security guard to inboxes. When appropriately deployed, DMARC uses the DNS to publish information to instruct a recipient (ISP) on what to do with that email should it fail SPF and DKIM authentication tests. There are three instructions when authentication fails

  • When P=None, it does nothing
  • When P=Quarantine, it will quarantine the email
  • When P=Reject, the email will be rejected and never get there

Setting up DMARC is relatively easy but hard to move from None to Reject to protect your domain fully.


A guarantee to get 100% inbox placement at all ISP’s. Deliverability is a combination of many things that make up your reputation, and DMARC is one piece of a massive pie. Do you want your DMARC analyzed?

DMARC Analyzer offers DMARC analyzing software and acts as your expert guide providing dmarc reports for all spf dkim and dmarc needs.


According to APWG, there are 201,591 unique phishing sites reported. If you want to protect your domain, prevent spoofing, and potentially give yourself insight and choice on email leaving your domain, this is a no-brainer given the sheer size and exposure you might open yourself up to. If you send emails from your domain to large ISP’s such as Google, Microsoft, Yahoo!, they all support DMARC.

DMARC is currently supported by all major ISPs (such as Google, Microsoft, Yahoo! etc). At the moment DMARC is awaiting approval to become an open standard approved The Internet Engineering Task Force (IETF).

The sophistication of spoofing, phishing scams, and malicious emails continues to boggle our minds here at iPost, so you want to make sure you do everything you can to prevent something by being proactive. The last thing you want to do is become reactive with email spoofing.


At iPost, we are here to help you with this, so contact us today for a free DMARC assessment.