An email authentication method designed to verify the authenticity of email messages and ensure that they have not been altered during transit. DKIM works by adding a digital signature to the email header, which is generated using a private key held by the sender's mail server. This signature can be verified by the recipient's mail server using a corresponding public key published in the DNS records of the sender's domain. The primary purpose of DKIM is to help prevent email spoofing and phishing by confirming that an email message genuinely originates from the claimed domain and has not been tampered with. By implementing DKIM, organizations can enhance their email security, improve deliverability, and protect their domain's reputation.