Cleanup the mailboxes for groups on deletion

src/groups.js

@@ -24,6 +24,7 @@ var assert = require('assert'),
     constants = require('./constants.js'),
     DatabaseError = require('./databaseerror.js'),
     groupdb = require('./groupdb.js'),
+    mailboxdb = require('./mailboxdb.js'),
     util = require('util'),
     uuid = require('uuid');
 
@@ -99,11 +100,15 @@ function remove(id, callback) {
     // never allow admin group to be deleted
     if (id === constants.ADMIN_GROUP_ID) return callback(new GroupError(GroupError.NOT_ALLOWED));
 
-    groupdb.del(id, function (error) {
-        if (error && error.reason === DatabaseError.NOT_FOUND) return callback(new GroupError(GroupError.NOT_FOUND));
+    mailboxdb.delByOwnerId(id, function (error) {
         if (error) return callback(new GroupError(GroupError.INTERNAL_ERROR, error));
 
-        callback(null);
+        groupdb.del(id, function (error) {
+            if (error && error.reason === DatabaseError.NOT_FOUND) return callback(new GroupError(GroupError.NOT_FOUND));
+            if (error) return callback(new GroupError(GroupError.INTERNAL_ERROR, error));
+
+            callback(null);
+        });
     });
 }