diff --git a/addons/mail_gateway/mail_gateway.py b/addons/mail_gateway/mail_gateway.py
index 5dae3d3bb16..3d2935548fa 100644
--- a/addons/mail_gateway/mail_gateway.py
+++ b/addons/mail_gateway/mail_gateway.py
@@ -128,6 +128,10 @@ class mailgate_thread(osv.osv):
         for case in cases:
             attachments = []
             for att in attach:
+                att_ids = att_obj.search(cr, uid, [('name','=',att[0])])
+                if att_ids:
+                    attachments.append(att_ids[0])
+                else:
                     attachments.append(att_obj.create(cr, uid, {'res_model':case._name,'res_id':case.id, 'name': att[0], 'datas': base64.encodestring(att[1])}))
 
             partner_id = hasattr(case, 'partner_id') and (case.partner_id and case.partner_id.id or False) or False