diff --git a/addons/portal_sale/portal_sale.py b/addons/portal_sale/portal_sale.py
index d4d5b64cea3..90d635177dc 100644
--- a/addons/portal_sale/portal_sale.py
+++ b/addons/portal_sale/portal_sale.py
@@ -59,12 +59,11 @@ class sale_order(osv.Model):
         assert len(ids) == 1
         document = self.browse(cr, uid, ids[0], context=context)
         partner = document.partner_id
+        # TDE note: this code should be improved: used a real invite wizard instead of an ugly email
         if partner.id not in document.message_follower_ids:
             self.message_subscribe(cr, uid, ids, [partner.id], context=context)
-            user = self.pool.get('res.users').browse(cr, uid, uid, context=context)
             mail_values = {
-                'email_from': user.partner_id.email,
-                'email_to': partner.email,
+                'recipient_ids': [(4, partner.id)],
                 'subject': 'Invitation to follow %s' % document.name_get()[0][1],
                 'body_html': 'You have been invited to follow %s' % document.name_get()[0][1],
                 'auto_delete': True,
@@ -72,7 +71,7 @@ class sale_order(osv.Model):
             }
             mail_obj = self.pool.get('mail.mail')
             mail_id = mail_obj.create(cr, uid, mail_values, context=context)
-            mail_obj.send(cr, uid, [mail_id], recipient_ids=[partner.id], context=context)
+            mail_obj.send(cr, uid, [mail_id], context=context)
         return super(sale_order, self).action_button_confirm(cr, uid, ids, context=context)
 
     def get_signup_url(self, cr, uid, ids, context=None):