diff --git a/addons/mail/data/mail_data.xml b/addons/mail/data/mail_data.xml
index 29a11948c6a..3645ba2e337 100644
--- a/addons/mail/data/mail_data.xml
+++ b/addons/mail/data/mail_data.xml
@@ -76,7 +76,7 @@
     </div>
 </div>
 % endif
-% if not ctx['is_discussion'] or not len(ctx['actions']) == 0 or ctx.get('button_access') or ctx.get('is_accessible'):
+% if not ctx['is_discussion'] or not len(ctx['actions']) == 0 or ctx.get('button_access'):
 <div summary="o_mail_notification">
 <table cellspacing="0" cellpadding="0" border="0" style="width: 100%; margin-top: 5px;">
 <tbody><tr>
diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index 53794d4038a..d551c97d418 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -114,11 +114,6 @@ class Message(models.Model):
         for message in self:
             message.needaction = message in my_messages
 
-    @api.multi
-    def _is_accessible(self):
-        self.ensure_one()
-        return False
-
     @api.model
     def _search_needaction(self, operator, operand):
         if operator == '=' and operand:
diff --git a/addons/mail/models/res_partner.py b/addons/mail/models/res_partner.py
index 125acce8010..78404ed8ec5 100644
--- a/addons/mail/models/res_partner.py
+++ b/addons/mail/models/res_partner.py
@@ -86,7 +86,6 @@ class Partner(models.Model):
             'tracking': tracking,
             'is_discussion': is_discussion,
             'subtype': message.subtype_id,
-            'is_accessible': message._is_accessible()
         }
 
     @api.model
diff --git a/addons/website_forum/models/forum.py b/addons/website_forum/models/forum.py
index 3ef6636af73..d36126de7f8 100644
--- a/addons/website_forum/models/forum.py
+++ b/addons/website_forum/models/forum.py
@@ -911,12 +911,3 @@ class Tags(models.Model):
         if self.env.user.karma < forum.karma_tag_create:
             raise KarmaError(_('Not enough karma to create a new Tag'))
         return super(Tags, self.with_context(mail_create_nolog=True, mail_create_nosubscribe=True)).create(vals)
-
-class Message(models.Model):
-    _name = 'mail.message'
-    _inherit = ['mail.message']
-
-    @api.multi
-    def _is_accessible(self):
-        res = super(Message, self)._is_accessible()
-        return self.model == 'forum.post' or res