You may need the help of your IT team to complete some of the steps in this article.
In order to ensure top-notch deliverability, we automatically sign all outbound mail with a shared Marketo DKIM signature.
You can personalize the DKIM signature to reflect the domain(s) of your choice. Here's how.
Go to the Admin section.
Click Email, then the DKIM tab, and finally Add Domain.
Enter the domain you will be using in Marketo emails as the From Address and click Add.
Send the Host Record and TXT Value to your IT. Ask them to create the record for you.
Once they confirm they've created the record, come back to Marketo, select your domain, and click Verify DNS.