To authorize Oracle Dyn to send emails on your behalf you will have to add them to your SPF record for each of the domains that you send from. The include mechanism used by Oracle Dyn is shown below.
You will also have to create DKIM records for each of your sending domains in order to sign your emails. This DKIM information can be found under your verified senders list.
For more information on the SPF and DKIM and how to configure them for your domains please click on the button below.
Create a free OnDMARC account to test your configuration.