"DKIM2 is an evolution of authentication based on all the things learned over the past 20 years. It improves overall security and reliability of email compared to DKIM and other current authentication protocols."
"The protocol itself is most similar to DKIM: email messages are cryptographically signed. The originator takes a hash of the headers and body, signs them with a private key, and adds the DKIM signature into the headers."
"Normal mail activities can cause messages to be changed during transit, breaking DKIM and causing mail to fail, particularly for domains that have chosen to publish p=reject."
DKIM2 is an evolving email authentication protocol currently under development by the IETF. It builds on the lessons learned from the past 20 years of email security. Similar to DKIM, it involves cryptographic signing of email messages. DKIM2 enhances security and reliability, addressing issues caused by previous authentication methods and spam filters. It aims to resolve problems that arise during normal mail activities, which can alter messages and lead to failures, especially for domains with strict rejection policies.
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