diff --git a/addons/mass_mailing/models/mass_mailing.py b/addons/mass_mailing/models/mass_mailing.py
index bd314f03a3d..2e8a82a8f4d 100644
--- a/addons/mass_mailing/models/mass_mailing.py
+++ b/addons/mass_mailing/models/mass_mailing.py
@@ -271,9 +271,9 @@ class MassMailing(osv.Model):
             date_begin_str = date_begin.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)
             date_end_str = date_end.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)
             domain = [('mass_mailing_id', '=', mailing.id), ('opened', '>=', date_begin_str), ('opened', '<=', date_end_str)]
-            res[mailing.id]['opened_dayly'] = json.dumps(self.__get_bar_values(cr, uid, obj, domain, ['opened'], 'opened_count', 'opened:day', date_begin, context=context))
+            res[mailing.id]['opened_daily'] = json.dumps(self.__get_bar_values(cr, uid, obj, domain, ['opened'], 'opened_count', 'opened:day', date_begin, context=context))
             domain = [('mass_mailing_id', '=', mailing.id), ('replied', '>=', date_begin_str), ('replied', '<=', date_end_str)]
-            res[mailing.id]['replied_dayly'] = json.dumps(self.__get_bar_values(cr, uid, obj, domain, ['replied'], 'replied_count', 'replied:day', date_begin, context=context))
+            res[mailing.id]['replied_daily'] = json.dumps(self.__get_bar_values(cr, uid, obj, domain, ['replied'], 'replied_count', 'replied:day', date_begin, context=context))
         return res
 
     def _get_statistics(self, cr, uid, ids, name, arg, context=None):
@@ -314,7 +314,7 @@ class MassMailing(osv.Model):
         'name': fields.char('Subject', required=True),
         'email_from': fields.char('From', required=True),
         'create_date': fields.datetime('Creation Date'),
-        'sent_date': fields.datetime('Sent Date'),
+        'sent_date': fields.datetime('Sent Date', oldname='date'),
         'body_html': fields.html('Body'),
         'attachment_ids': fields.many2many(
             'ir.attachment', 'mass_mailing_ir_attachments_rel',
@@ -340,7 +340,7 @@ class MassMailing(osv.Model):
         'reply_to': fields.char('Reply To', help='Preferred Reply-To Address'),
         # recipients
         'mailing_model': fields.selection(_mailing_model, string='Recipients Model', required=True),
-        'mailing_domain': fields.char('Domain'),
+        'mailing_domain': fields.char('Domain', oldname='domain'),
         'contact_list_ids': fields.many2many(
             'mail.mass_mailing.list', 'mail_mass_mailing_list_rel',
             string='Mailing Lists',
@@ -398,16 +398,14 @@ class MassMailing(osv.Model):
             _get_statistics, string='Replied Ratio',
             type='integer', multi='_get_statistics',
         ),
-        # dayly ratio
-        'opened_dayly': fields.function(
+        # daily ratio
+        'opened_daily': fields.function(
             _get_daily_statistics, string='Opened',
             type='char', multi='_get_daily_statistics',
-            oldname='opened_monthly',
         ),
-        'replied_dayly': fields.function(
+        'replied_daily': fields.function(
             _get_daily_statistics, string='Replied',
             type='char', multi='_get_daily_statistics',
-            oldname='replied_monthly',
         )
     }
 
diff --git a/addons/mass_mailing/models/mass_mailing_stats.py b/addons/mass_mailing/models/mass_mailing_stats.py
index 319a6fde14d..7e8c194f42e 100644
--- a/addons/mass_mailing/models/mass_mailing_stats.py
+++ b/addons/mass_mailing/models/mass_mailing_stats.py
@@ -19,23 +19,8 @@
 #
 ##############################################################################
 
-from datetime import datetime
-from dateutil import relativedelta
-import random
-try:
-    import simplejson as json
-except ImportError:
-    import json
-import urllib
-import urlparse
-
-from openerp import tools
-from openerp.exceptions import Warning
-from openerp.tools.safe_eval import safe_eval as eval
-from openerp.tools.translate import _
 from openerp.osv import osv, fields
 
-
 class MailMailStats(osv.Model):
     """ MailMailStats models the statistics collected about emails. Those statistics
     are stored in a separated model and table to avoid bloating the mail_mail table
@@ -48,11 +33,7 @@ class MailMailStats(osv.Model):
     _order = 'message_id'
 
     _columns = {
-        'mail_mail_id': fields.integer(
-            'Mail ID',
-            help='ID of the related mail_mail. This field is an integer field because'
-                 'the related mail_mail can be deleted separately from its statistics.'
-        ),
+        'mail_mail_id': fields.many2one('mail.mail', 'Mail ID', ondelete='set null'),
         'message_id': fields.char('Message-ID'),
         'model': fields.char('Document model'),
         'res_id': fields.integer('Document ID'),
@@ -106,4 +87,3 @@ class MailMailStats(osv.Model):
         stat_ids = self._get_ids(cr, uid, ids, mail_mail_ids, mail_message_ids, [('bounced', '=', False)], context)
         self.write(cr, uid, stat_ids, {'bounced': fields.datetime.now()}, context=context)
         return stat_ids
-
diff --git a/addons/mass_mailing/views/mass_mailing.xml b/addons/mass_mailing/views/mass_mailing.xml
index 7892feacacc..a1d0241ea4f 100644
--- a/addons/mass_mailing/views/mass_mailing.xml
+++ b/addons/mass_mailing/views/mass_mailing.xml
@@ -208,11 +208,11 @@
                             </button>
                             <button name="%(action_view_mass_mailing_contacts)d"
                                 type="action" class="oe_stat_button oe_inline">
-                                <field name="opened_dayly" string="Opened Daily" widget="barchart"/>
+                                <field name="opened_daily" string="Opened Daily" widget="barchart"/>
                             </button>
                             <button name="%(action_view_mass_mailing_contacts)d"
                                 type="action" class="oe_stat_button oe_inline">
-                                <field name="replied_dayly" string="Replied Daily" widget="barchart"/>
+                                <field name="replied_daily" string="Replied Daily" widget="barchart"/>
                             </button>
                         </div>
                         <div class="oe_button_box" attrs="{'invisible': [('total', '=', 0)]}" style="margin-bottom: 32px">