diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index 259781dbb4c..899f0f0eb71 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -49,7 +49,7 @@ class Message(models.Model):
     # content
     subject = fields.Char('Subject')
     date = fields.Datetime('Date', default=fields.Datetime.now)
-    body = fields.Html('Contents', default='')
+    body = fields.Html('Contents', default='', strip_classes=True)
     attachment_ids = fields.Many2many(
         'ir.attachment', 'message_attachment_rel',
         'message_id', 'attachment_id',
diff --git a/openerp/fields.py b/openerp/fields.py
index d21f9e2ecc1..70cf03517ba 100644
--- a/openerp/fields.py
+++ b/openerp/fields.py
@@ -1273,7 +1273,7 @@ class Html(_String):
     _slots = {
         'sanitize': True,               # whether value must be sanitized
         'strip_style': False,           # whether to strip style attributes (otherwise: sanitized)
-        'strip_classes': True,          # whether to strip classes attributes
+        'strip_classes': False,         # whether to strip classes attributes
     }
 
     def _setup_attrs(self, model, name):
diff --git a/openerp/osv/fields.py b/openerp/osv/fields.py
index eb5917e8978..a4bf882478c 100644
--- a/openerp/osv/fields.py
+++ b/openerp/osv/fields.py
@@ -352,7 +352,7 @@ class html(text):
             return value
         return html_sanitize(value, silent=True, strict=True, strip_style=self._strip_style, strip_classes=self._strip_classes)
 
-    def __init__(self, string='unknown', sanitize=True, strip_style=False, strip_classes=True, **args):
+    def __init__(self, string='unknown', sanitize=True, strip_style=False, strip_classes=False, **args):
         super(html, self).__init__(string=string, **args)
         self._sanitize = sanitize
         self._strip_style = strip_style