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Today in Term of the Week we explore why all email marketers should know what DKIM is and use it.

Essentially, DKIM (DomainKeys Identified Mail) is a digitally encrypted signature used in a message, for the purpose of checking if the source is genuine. It resulted from the merger of Yahoo’s DomainKeys and Cisco’s Identified Internet Mail protocols.

How does it work?

To understand it, we need to look at the bigger picture. In order for DKIM to work, a domain owner needs to create a pair of keys:

Think of it as similar to the medieval practice of using a wax seal on a note. It was easy to show everyone your seal, make it public so it could be recognised. People receiving a note from you could check the seal matched yours to confirm it was from you. But it was difficult for someone to create an exact copy of your seal and pretend to be you.

Why should email marketers care?

Spammers sometimes forge ‘From’ addresses. So the receiver might get an email from you@yourdomain.com when it wasn’t actually sent from that email address. And because it’s spam, the receiver will lose trust in you as a sender and mark the message as spam. But if you have created the private and public keys, the spoof email sent by the spammer won’t have the DKIM signature in it, so the email will be rejected as not genuine.

If you have a term you’d like explaining, simply leave a comment below. Or see other Terms of the Week.

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