diff --git a/addons/mail/mail_message.py b/addons/mail/mail_message.py
index 3637bb371dc..4f1c0a00e77 100644
--- a/addons/mail/mail_message.py
+++ b/addons/mail/mail_message.py
@@ -730,7 +730,7 @@ class mail_message(osv.Model):
                 ], context=context)
             fol_objs = fol_obj.read(cr, uid, fol_ids, ['partner_id'], context=context)
             partners_to_notify |= set(fol['partner_id'][0] for fol in fol_objs)
-        # when writing to a wall
+        # remove me from notified partners, unless the message is written on my own wall
         if message.get('author_id') and message.get('model') == "res.partner" and message.get('res_id') == message.get('author_id')[0]:
             partners_to_notify |= set([message.get('author_id')[0]])
         elif message.get('author_id'):
diff --git a/addons/mail/mail_thread.py b/addons/mail/mail_thread.py
index a7ebefdce25..4790fb3393f 100644
--- a/addons/mail/mail_thread.py
+++ b/addons/mail/mail_thread.py
@@ -588,7 +588,7 @@ class mail_thread(osv.AbstractModel):
             else:
                 msg_dict['email_from'] = message.get('from')
         partner_ids = self._message_find_partners(cr, uid, message, ['From', 'To', 'Cc'], context=context)
-        msg_dict['partner_ids'] = partner_ids
+        msg_dict['partner_ids'] = [(4, partner_id) for partner_id in partner_ids]
 
         if 'Date' in message:
             date_hdr = decode(message.get('Date'))
diff --git a/addons/mail/res_partner.py b/addons/mail/res_partner.py
index 46b250328f8..6f291f62f1b 100644
--- a/addons/mail/res_partner.py
+++ b/addons/mail/res_partner.py
@@ -54,7 +54,8 @@ class res_partner_mail(osv.Model):
             thread_id = thread_id[0]
         if type == 'email':
             partner_ids = kwargs.get('partner_ids', [])
-            partner_ids.append(thread_id)
+            if thread_id not in partner_ids:
+                partner_ids.append(thread_id)
             kwargs['partner_ids'] = partner_ids
             return super(res_partner_mail, self).message_post(cr, uid, False, body=body, subject=subject,
                 type=type, subtype=subtype, parent_id=parent_id, attachments=attachments, context=context, **kwargs)