Editing Email Authentication (section)

=== DKIM ===
DKIM (Domain Keys Identified Mail) is a signature any sender can apply to their email messages. This signature makes clear that the message's sender is actually the message's sender and not a bad actor. You can use any domain as the signature. For example, a company called "Dog Bandanas" will sign their messages with the "dogbandanas.com" domain to confirm that the message was sent by "Dog Bandanas."

This is accomplished by inserting a hidden, cryptographic signature into your email header (ActiveCampaign will do this) and then placing a public key on your website's DNS that verifies the authenticity of this signature.

DKIM will help prevent spoofing and phishing of your domain, and an added benefit is that it allows Mailbox Providers such as Gmail, Microsoft, and Oath (Yahoo, AOL, Verizon) to track the email reputation of your sending domain.

If the reputation of your sending domain is stronger than the reputation of the sending IPs, Mailbox Providers may default to your sending domain reputation, which could improve your email performance.

To set up DKIM with ActiveCampaign, you just need to set up a sending domain. Setting up a sending domain walks you through setting up DKIM. To learn more about DKIM, you can check out this detailed DKIM guide from our Postmark team.