diff --git a/etc/roundcube/main.inc.php b/etc/roundcube/main.inc.php
index b7888eb..fa16c1d 100644
--- a/etc/roundcube/main.inc.php
+++ b/etc/roundcube/main.inc.php
@@ -28,8 +28,9 @@
 $rcmail_config['http_received_header'] = true;
 $rcmail_config['http_received_header_encrypt'] = true;
 
-# Dejar vacío a menos que empecemos a alojar múltiples dominios
-$rcmail_config['username_domain'] = '';
+# Dominio
+$rcmail_config['username_domain'] = '%d';
+$rcmail_config['mail_domain'] = '%d';
 
 # User Agent
 $rcmail_config['useragent'] = 'Partido Pirata/'.RCMAIL_VERSION;