To authorise CSOD to send emails on your behalf of your domain, add their mechanisms to your SPF record.
CSOD SPF information can be found below, in the Files section of the article.
To configure DKIM for CSOD and generate the correct DKIM selector to add to your DNS, contact your CSOD Account Manager.
Testing Your Configuration
To test your configuration for both SPF and DKIM is correctly configured, start your 14 day free trial with OnDMARC!