DMARC is a policy layer for email which helps to ensure that emails meet two standards: DomainKeys IdentifiedMail (DKIM) and Sender-Policy Framework (SPF). These standards help to make sure that emails are not phishing attacks and that emails sent from your domain are compliant with DMARC regulations, so that they are not flagged as being fraudulent or unsafe email communications.
See this comparison of MxToolBox Delivery Center vs GoDMARC. MxToolBox Delivery Center rates 0.0/5 stars. GoDMARC rates 0.0/5 stars.
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