At the moment we only have 1 email field per contact record, but of course, you have the ability to store extra as custom fields (it just will not send as a fallback).
An example here would be if a person has two emails work and personal. At present, an email will be sent to the email id added in the default field.
We are planning, down the road, to add multiple email address fields per contact record. There is an existing feedback card/feature request for this called 'Multiple Email Addresses in 1 Contact Record' on our page https://feed.uptics.io/requests/en that you are more than welcome to upvote!