What is DMARC and why do you need it
Domain-based Message Authentication, Reporting and Conformance (DMARC) is an email authentication protocol. It gives email domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing. You need to implement DMARC to send emails from your business platforms so that they end up in the inbox instead of the spam folder. Most major email providers now require DMARC to be updated every year. This is to protect a domain from being used in business email compromise attacks, phishing, scams and other cyber threat activities.
Once the DMARC DNS entry is published, any receiving email server can authenticate the incoming email based on the instructions published by the domain owner within the DNS entry. If the email passes the authentication, it will be delivered and can be trusted. If the email fails the check, depending on the instructions held within the DMARC record the email could be delivered, quarantined or rejected.
DMARC works on the basis of two existing email authentication mechanisms, Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). It allows the owner of a domain to publish a policy in their DNS records to specify how to check the From: field presented to end users; how the receiver should deal with failures.
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