diff --git a/lib/extensions/perms-to-email.js b/lib/extensions/perms-to-email.js
new file mode 100644
index 0000000..80bc9ac
--- /dev/null
+++ b/lib/extensions/perms-to-email.js
@@ -0,0 +1,12 @@
+'use strict';
+
+var perms = require('./permissions.json');
+var emails = {};
+perms.forEach(function (p) {
+  p.nodes.forEach(function (n) {
+    if ('email' === n.type) {
+      emails[n.name] = true;
+    }
+  });
+});
+console.log(Object.keys(emails).join(', '));