diff --git a/addons/mail/mail_mail.py b/addons/mail/mail_mail.py
index eb5ec30496e..1b3ca152a9a 100644
--- a/addons/mail/mail_mail.py
+++ b/addons/mail/mail_mail.py
@@ -157,7 +157,7 @@ class mail_mail(osv.Model):
             :param browse_record partner: specific recipient partner
         """
         if force or (not mail.subject and mail.model and mail.res_id):
-            return '%s posted on %s' % (mail.author_id.name, mail.record_name)
+            return 'Re: %s' % (mail.record_name)
         return mail.subject
 
     def send_get_mail_body(self, cr, uid, mail, partner=None, context=None):
diff --git a/addons/mail/tests/test_mail_features.py b/addons/mail/tests/test_mail_features.py
index e4e4c1a19b4..4302dab8669 100644
--- a/addons/mail/tests/test_mail_features.py
+++ b/addons/mail/tests/test_mail_features.py
@@ -339,7 +339,7 @@ class test_mail(TestMailBase):
 
         # Mail data
         _subject = 'Pigs'
-        _mail_subject = '%s posted on %s' % (user_raoul.name, group_pigs.name)
+        _mail_subject = 'Re: %s' % (group_pigs.name)
         _body1 = '<p>Pigs rules</p>'
         _mail_body1 = '<p>Pigs rules</p>\n<div><p>Raoul</p></div>\n'
         _mail_bodyalt1 = 'Pigs rules\nRaoul\n'