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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.

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.

The Confidential mode in Gmail is a feature that helps you keep your messages safe by preventing the recipient from forwarding, copying, printing, or downloading your email. In the bottom right-hand corner of this window, you'll see a small lock icon ? click on this to turn on the Gmail Confidential Mode.

You can send messages and attachments with Gmail's confidential mode to help protect sensitive information from unauthorized access. You can use confidential mode to set an expiration date for messages or revoke access at any time.

While they both are authentication protocols, SPF and DKIM are not exactly the same. SPF is used to authenticate the sender and ensure that only authorized servers can send emails from your domain, while DKIM is used to verify that messages haven't been tampered with in transit.

The difference between them, in a nutshell, is that DKIM attempts to verify whether mail is legitimate, and DMARC suggests what to do with mail that isn't legitimate. The technical details are more complicated, of course.

SPF, DKIM, and DMARC help authenticate email senders by verifying that the emails came from the domain that they claim to be from. These three authentication methods are important for preventing spam, phishing attacks, and other email security risks.