How to send email to alternate email address using CDO services
Assuming that we all are aware of Custom Objects, for more info - https://docs.oracle.com/cloud/latest/marketingcs_gs/OMCAA/Help/CustomObjects/CustomObjects.htm
What is Custom Object Services? Custom object record services monitor the changes within a custom object. They run every 15 minutes and are used to automatically trigger one or more actions with your custom object records, such as sending them to a program.
Use Case: You wanted to collect alternate email addresses of few customers via form and would like to send emails to their alternate email address. We all aware that “Email Address” is a system field and submitting a new information via any form will create a new record in Eloqua also, saving the alternate email address in a custom contact field will not help, as we will not be able to send emails to them.