Provide select dropdown for app inbox

src/js/client.js

@@ -2595,6 +2595,29 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
     };
 
     // Mailboxes
+    Client.prototype.getAllMailboxes = function (callback) {
+        var that = this;
+
+        this.getDomains(function (error, domains) {
+            if (error) return callback(error);
+
+            var mailboxes = [];
+            async.eachLimit(domains, 5, function (domain, callback) {
+                that.listMailboxes(domain.domain, '', 1, 1000, function (error, result) {
+                    if (error) return callback(error);
+
+                    mailboxes = mailboxes.concat(result);
+
+                    callback();
+                });
+            }, function (error) {
+                if (error) return callback(error);
+
+                callback(null, mailboxes);
+            });
+        });
+    };
+
     Client.prototype.getMailboxCount = function (domain, callback) {
         get('/api/v1/mail/' + domain + '/mailbox_count', null, function (error, data, status) {
             if (error) return callback(error);