DomainKeys Identified Mail (DKIM) is basically used for E-mail authentication. The aim of domain keys is to detect whether emails come from their claimed domain. DomainKeys is a rapidly emerging Internet standard mainly used by Yahoo Mail as well as Gmail. Yahoo has even acquired the patents (U.S. Patent 6,986,049) for DomainKeys. Compared to the normal method of email authentication, Domain Keys offers almost end-to-end integrity from a signing Mail Transfer Agent (MTA) to a verifying MTA. The basic working of Domain Keys can be summarized as follows:

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