What key issue should be addressed? A retail company’s database of record resides at a 3rdparty company that also keeps track of purchase history. That database only updates once a day where new records can be created and merged. The database uses an “Email ID”, which is a numeric field that represents both the business unit and email address. The company now wants to be able to send Real-Time Welcome emails to people (newly registered website users) who provide their email address in exchange for getting 10% off their first order, and ensure their send is connected to the “Email ID” in the database.
The database uses an "Email ID", which is a numeric field that represents both the business unit and email address. Therefore you don't have to ask 'Will new users have an "Email ID?" This is incorrect. More logical is to know is there is a customer preference center needed so newly registered customers have possibility to opt out.