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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 ...
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 ...
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.
DNS-based Authentication of Named Entities (DANE) is an Internet security protocol to allow X.509 digital certificates, commonly used for Transport Layer Security (TLS), to be bound to domain names using Domain Name System Security Extensions ().
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 ...
Various anti-spam techniques are used to prevent email spam (unsolicited bulk email).. No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) as opposed to not rejecting all spam email (false negatives) – and the associated costs in time, effort, and cost of wrongfully obstructing good mail.
Another possibility is to store the long rewritten address somewhere in the message header. The i= tag of a DKIM-Signature may be a good place, as such choice considerably improves the security, and this technique has been observed. [5] Unless there is a backup mechanism, it can only work if the bounce message is in a standard format. [6]