DKIM
DKIM (DomainKeys Identified Mail) is an email authentication method that allows the receiver to check that an email was indeed sent and authorized by the owner of the domain from which it claims to originate. It works by adding a digital signature to the email header, which is verified using a public key published in the sender's DNS records. This helps prevent email spoofing and phishing attacks by ensuring the integrity of the email content and sender identity.
Developers should learn and implement DKIM when building or maintaining email systems to enhance security and deliverability, particularly for transactional emails, newsletters, or any application that sends automated emails. It is crucial for compliance with email standards (e.g., DMARC policies) and to improve email reputation, reducing the risk of messages being marked as spam. Use cases include e-commerce platforms, marketing tools, and corporate email servers where trust and authenticity are paramount.