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DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam. DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [1]
However, a strict DMARC policy may block legitimate emails sent through a mailing list or forwarder, as the DKIM signature will be invalidated if the message is modified, such as by adding a subject tag or footer, and the SPF check will either fail (if the forwarder didn't change the bounce address) or be aligned with the mailing list domain ...
The leftmost result columns, labelled SPF and DKIM show DMARC-wise results, either pass or fail, taking alignment into account. The rightmost ones, with similar labels, show the name of the domain which claims to participate in the sending of the message and (in parentheses) the authentication status of that claim according to the original ...
A DKIM-compliant domain administrator generates one or more pairs of asymmetric keys, then hands private keys to the signing MTA, and publishes public keys on the DNS. The DNS labels are structured as selector ._domainkey.example.com , where selector identifies the key pair, and _domainkey is a fixed keyword, followed by the signing domain's ...
SPF (or DKIM) can be used together with DMARC though, to also check the From field of the mail header. This is called 'identifier alignment'. This is called 'identifier alignment'. Custom proprietary implementations are required to protect against such display name spoofing and cannot utilize SPF.
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DomainKeys Identified Mail (DKIM) – an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam. Domain-based Message Authentication, Reporting and Conformance (DMARC) – an email authentication protocol. It is designed to give email domain owners the ...