How do you send Trigger and Bulk emails to multiple email types.

Hello,

As a part of the contact object I have two different types of email communication options a) The Regular OOTB email field and b) newly added 'Communication Option' of type 'email' called "Corporate Email"

How can I specify the system to use the email id in the "Corporate Email" field for bulk emails and for trigger emails and not utilize the value in the OOTB email column while sending out bulk emails or when running marketing campaigns?