Please explain about differences between DomainKeys vs DKIM
DomainKeys Identified Mail, or DKIM, is a technical standard that helps protect email senders and recipients from spam, spoofing, and phishing. It is a form of email authentication that allows an organization to claim responsibility for a message in a way that can be validated by the recipient.
The two primary authentication protocols that help validate that an email message comes from who it claims to come from are SPF and DKIM. Layered on top of SPF and DKIM is DMARC. DMARC uses SPF and DKIM and provides a set of instructions to receiving email servers with what to do if they receive unauthenticated mail.
DKIM (DomainKeys Identified Mail) is a protocol that allows an organization to take responsibility for transmitting a message by signing it in a way that mailbox providers can verify. DKIM record verification is made possible through cryptographic authentication.
DKIM (Domain Keys Identified Mail) adds a cryptographic hash or signature as a new header to outbound messages. This ensures outbound messages haven't been altered after leaving the sending organization's mail server, by matching the hash or signature to the DNSrecords.
DomainKeys Identified Mail (DKIM) is the successor to Yahoo DomainKeys. Being very similar in functionality to DomainKeys, DKIM has additionally adopted aspects from Cisco’s Identified Internet Mail standard (IIM), and the result has been an enhanced standard that provides more flexibility and security than its predecessor. Some of the differences between DomainKeys and DKIM include:
http://www.socketlabs.com/articles/show/email-authentication-guide?page=6
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