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.
How is it related to SPF, DMARC, or other standards?
DKIM, SPF, and DMARC are all standards that enable different aspects of email authentication. They address complementary issues.
- SPF allows senders to define which IP addresses are allowed to send mail for a particular domain.
- DKIM provides an encryption key and digital signature that verifies that an email message was not faked or altered.
- DMARC unifies the SPF and DKIM authentication mechanisms into a common framework and allows domain owners to declare how they would like email from that domain to be handled if it fails an authorization test.
Do I need DKIM?
If you are a business sending commercial or transactional email, you definitely need to implement one or more forms of email authentication to verify that an email is actually from you or your business. Properly configuring email authentication standards is one of the most important steps you can take to improve your deliverability. However, by itself it only goes so far; Email It and other email experts recommend also implementing SPF and DMARC to define a complete email authentication policy.
Learn More about DKIM
Read more about DKIM best practices
DKIM.org. The group that developed the DKIM standard has published detailed explanations, how-to’s, and news about DKIM.