In the Contributors page you have listed all the users assigned to the projects hosted on your account and to the localization projects you're an admin of. If you click on User info next to the username, you will see user's email address, as well as how many translations and words they added and when their last contribution was. Note that there is no option to export a list of contributors from the Contributors page.
If you want to download a list of the contributors assigned to a project, you can do this in the Stats page. To export a list with the name, email and contributions of the users assigned to a project from the Stats page, click on the Reports by Contributor tab in the top rigth corner, and then on the Export link at the bottom right corner.
You can also get a list of the translators assigned to a localization project using the API, with the help of the contributors/list method.