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Conversely, when the DMARC domain has a restrictive policy of " p=quarantine " or " p=reject ," SecurityGateway can optionally reject the message, filter it automatically to the receiving user's Quarantine folder, add some text to its Subject header, or adjust its Message Score.
MDAEMON DMARC VERIFICATION
If a message fails DMARC verification and the DMARC domain has a policy of " p=none " then no punitive action will be taken and normal message processing will continue. If it fails, however, then the fate of the message is determined by a combination of the domain's DMARC policy and how you have configured SecurityGateway to deal with those messages. If the message passes then it will proceed normally through the rest of SecurityGateway's delivery and filtering processes. Additionally, DMARC utilizes SPF and DKIM to validate each message and requires it to pass at least one of those tests in order to pass DMARC verification. This is done to determine whether or not the domain uses DMARC, and if so, to retrieve its DMARC DNS record, which contains its policy and other DMARC related information.
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DMARC VerificationĪs part of the DMARC verification process, SecurityGateway performs a DMARC DNS query on the domain found in the From: header of each incoming message. Under Security » Anti-Spoofing, there are three screens for configuring SecurityGateway's DMARC verification and reporting features: DMARC Verification, DMARC Reporting, and DMARC Settings. DMARC's reporting features can be useful for determining the effectiveness of your email authentication procedures and how frequently your domain name is being used in forged messages. In addition to the policy, the domain's DMARC DNS record can also contain requests for the server to send DMARC reports to someone, outlining the number of incoming messages purporting to be from that domain and whether or not they passed or failed authentication, and with details about any failures. This policy, which is retrieved by the receiving server via a DNS query while processing the incoming message, can state that the server should quarantine or reject messages that do not align with the policy, or take no action at all (i.e. DMARC makes it possible for domain owners to use the Domain Name System (DNS) to inform receiving servers of their DMARC policy, which is how they want those servers to handle messages that purport to be sent from their domain but cannot be authenticated as having actually come from it. Domain-based Message Authentication, Reporting & Conformance (DMARC) is a specification designed to help reduce email message abuse, such as incoming spam and phishing messages that misrepresent their origins by forging the message's From: header.