What is DKIM (DomainKeys Identified Mail)?

🔎 What is DKIM?

DKIM is an email authentication method, using digital signature attached to the header of email. In a nutshell, when DKIM is published in the DNS records of a domain, it will display a public key that recipient servers can match with the encrypted key in the signature.

It allows:

• The receiver to check if an incoming email is authentic (i.e. hasn't been modified by any third party since being sent).
• The receiver to verify that the email has been sent from an address associated with the right sending domain.

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💡 Why it is so important?

DKIM, along with DMARC and SPF have been created to prevent spoofed emails, spam, or other any malicious emails; by verifying email authenticity to improve online safety.

As for any email security protocols, having a DKIM properly set improves the deliverability of emails sent from this domain.

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📹 Video explanation