Thanks for your question!
Users can showcase their email addresses within their profile for all members to see. This can be done on a user level by going to Profile > Edit Profile. From here, users can add their email addresses within the "About You" section. In addition, users can add other points of contact by selecting "Social Media" where they can include social handles.
Alternatively, you could export the user data into an excel sheet and create a file of the users and their email addresses to then share as a post within your community for members to access. This can be done by going to Admin Settings > Reports > Users > Export All.