To authorise Sender to send emails on behalf of your domain, add their mechanism to your SPF record. The SPF mechanism for Sender is:
To configure DKIM for Sender you must navigate to My Account > Sending Domains then click the Actions button on the right-hand side of the sender you wish to configure. Under Actions select "Verify DKIM and SPF Records".
The window that opens will provide information for the DKIM record to be added to your DNS.
Testing Your Configuration
To test your configuration for both SPF and DKIM is correctly configured, start your 14 day free trial with OnDMARC!