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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]
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 ...
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Even if the SPF and DKIM validation fail, the receiving service can choose to validate the ARC chain. If it indicates that the original message passed the SPF and DKIM checks, and the only modifications were made by intermediaries trusted by the receiving service, the receiving service may choose to accept the email.
An Author Domain Signature is a valid DKIM signature in which the domain name of the DKIM signing entity, i.e., the d tag in the DKIM-Signature header field, is the same as the domain name in the author address. This binding recognizes a higher value for author domain signatures than other valid signatures that may happen to be found in a message.
In the example, the first row represents the main mail flow from example.org, and the second row is a DKIM glitch, such as signature breakage due to a minor alteration in transit. The third and fourth rows show typical failures modes of a forwarder and a mailing list, respectively.
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domain.name.example._vouch.vouching.example. The returned data, if any, is a space-delimited list of all the types that the service vouches, given as lowercase ASCII. They should match the self-asserted message content. The types defined are transaction, list, and all. Auditing the message may allow to establish whether its content corresponds.