However, a strict DMARC policy might block legitimate emails sent through a mailing list or forwarder, as the SPF check will fail due to the unapproved sender, and the DKIM signature will be invalidated if the message is modified, such as by adding a subject tag or footer. Plus, it tells a receiving service what to do if neither of those authentication methods passes-such as accept, quarantine, or reject the message. To revisit, DMARC consents a sender’s domain to indicate that their emails are protected by SPF and/or DKIM. ARC Overviewīecoming DMARC compliant is crucial to your company’s email success. A benefit of this tool is that it allows a receiving email service to validate a message when the email’s SPF and DKIM records are found invalid by an intermediate server’s processing. With ARC, all of the original authentication information is kept and as an email is forwarded the ARC results provide a chain of custody so that the end recipient's mail server can see that the email with DKIM authenticated before all of the forwarding.Įssentially, ARC is an email authentication protocol designed to permit an intermediate mail server-such as a mailing list or forwarding service-to sign an email’s original authentication results. The prime benefit of ARC and its implementation by the majority of mail servers is that it solves a previous problem that existed when a DMARC protected email was forwarded and caused the email to fail DKIM authentication and thus fail DMARC. In addition, it shows the message’s authentication assessment each step throughout handling. The Authenticated Received Chain (ARC) system for DMARC, or ARC for short, provides a valid “chain of custody” for email messages, allowing each entity that handles the message to effectively see all entities that previously handled it.
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March 2023
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