diff --git a/addons/mail/models/mail_channel.py b/addons/mail/models/mail_channel.py
index 1491039e860..7012f621849 100644
--- a/addons/mail/models/mail_channel.py
+++ b/addons/mail/models/mail_channel.py
@@ -197,7 +197,7 @@ class Channel(models.Model):
         # http://blogs.technet.com/b/exchange/archive/2006/10/06/3395024.aspx
         headers['X-Auto-Response-Suppress'] = 'OOF'
         if self.alias_domain and self.alias_name:
-            headers['List-Id'] = '%s.%s' % (self.alias_name, self.alias_domain)
+            headers['List-Id'] = '<%s.%s>' % (self.alias_name, self.alias_domain)
             headers['List-Post'] = '<mailto:%s@%s>' % (self.alias_name, self.alias_domain)
             # Avoid users thinking it was a personal message
             # X-Forge-To: will replace To: after SMTP envelope is determined by ir.mail.server
diff --git a/addons/point_of_sale/static/src/js/screens.js b/addons/point_of_sale/static/src/js/screens.js
index 2d61f4b63a9..e64e12ffd38 100644
--- a/addons/point_of_sale/static/src/js/screens.js
+++ b/addons/point_of_sale/static/src/js/screens.js
@@ -1228,9 +1228,14 @@ var ClientListScreenWidget = ScreenWidget.extend({
             self.saved_client_details(partner_id);
         },function(err,event){
             event.preventDefault();
+            var error_body = _t('Your Internet connection is probably down.');
+            if (err.data) {
+                var except = err.data;
+                error_body = except.arguments && except.arguments[0] || except.message || error_body;
+            }
             self.gui.show_popup('error',{
                 'title': _t('Error: Could not Save Changes'),
-                'body': _t('Your Internet connection is probably down.'),
+                'body': error_body,
             });
         });
     },