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An email authentication method that adds a cryptographic digital signature to outgoing emails, allowing receiving mail servers to verify that the message has not been tampered with in transit.
In plain English
DKIM works like a wax seal on a letter. When your email server sends a message, it adds a digital signature created with a private key. The recipient's server checks this signature against a public key published in your DNS records. If the signature matches, the email is genuine and unaltered. If it doesn't match, the email may have been forged or tampered with.