![]() ![]() What is a DMARC recordĪ DMARC record is a TXT-typed record published on a domain in the DNS, by the domain owner or administrator. Refer to the official specification of DMARC here: DMARC RFC7489. Here is a visual presentation of how DMARC works from : DMARC checks the results returned by SPF and DKIM and determines if an incoming email passes authentication or not and, depending on the policy specified in the DMARC record, takes certain action to keep malicious spoofing attempts at bay. DMARC builds on top of another two widely adopted email protocols, SPF and DKIM. It's an email authentication protocol with reporting and policy enforcement capabilities built in. ![]() What is DMARCĭMARC stands for "Domain-based Message Authentication, Reporting & Conformance". To fix this, you need to start implementing DMARC, which is the ratified industry standard for email authentication, for your domain. Any spoofing attacker can send malicious emails using your domain, which potentially incurs damage to your brand after landing in your customers' mailboxes. "Hostname returned a missing or invalid DMARC record"Īny of these messages or similar means one thing: the DMARC check reveals that your domain is not secured and is subject to spoofing attacks. When you use various online tools to check a domain's DMARC record, you might run into one of the errors:
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