DKIM
DKIM (DomainKeys Identified Mail) is an email authentication method that allows the sender to cryptographically sign outgoing emails, enabling the recipient to verify that the message originated from the claimed domain and hasn't been altered in transit. It works by adding a digital signature to the email header, which is validated using a public key published in the sender's DNS records. This helps combat email spoofing and phishing by ensuring email integrity and authenticity.
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's essential for compliance with email standards (e.g., DMARC policies) and to improve sender reputation, reducing the risk of emails being marked as spam. Use cases include web applications with email notifications, marketing platforms, and enterprise email servers.