Though a feature idea has been created here - Be able to search by email in the admin console /people area - which would add in a wildcard search to the admin console, this type of searching is not currently possible via the admin console.
That being said, there are a couple of options available to pull a list of users containing their email addresses.
1. As a full access admin user, the "Profile Completion" report found in the Community Manager Report's .csv export file will contain email information
2. The Jive REST API v3.14 → Person service will also allow you to pull a report from your instance which contains a user's email address.