DKIM
Email authentication method to prevent forgery
DKIM (DomainKeys Identified Mail) and its predecessor DomainKeys are methods for email
authentication that prove that an email is coming from the domain it claims to come from. DKIM
uses public key cryptography to add a signature to the mail header, allowing the
recipient to verify that the email is sent from the domain it claims to be sent from
(only this domain knows the private key) and that it has not been tampered with (the signature would
break otherwise). The technology is particularly popular with senders whose domains are frequently
used by phishers. It works well together with SPF.
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