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What is DKIM? What is the benefit? Why Need DKIM?

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What is DKIM? What is the benefit? Why Need DKIM? (DKIM) Domain Keys Identified Mail is a method to validate the authenticity of email messages. When an email is sent, it is signed with a private key and then validated using a public key in DNS on the receiving mail server (or ISP).  Why should also implement SPF and DMARC? SPF, DKIM, and DMARC work together to enable different facets of email authentication and deliverability. SPF defines which IP addresses are allowed to send mail for your domain. Domain Keys Identified Mail protects your email from being forwarded, spoofed, or altered. DMARC specifies how Internet Service providers (ISPs) should handle emails that fail either SPF or DKIM. DMARC and the DMARC Analyzer work with SPF and DKIM. Together, they can make emails more reliable and get the best result for email security. For example: If a hacker attempts to send an email on behalf of yourname@yourdomain.com without your Domain Keys Identified Mail private key, the Domain