diff --git a/openerp/tools/misc.py b/openerp/tools/misc.py
index c9283a839d4..ba6ea1137d1 100644
--- a/openerp/tools/misc.py
+++ b/openerp/tools/misc.py
@@ -27,12 +27,11 @@ Miscellaneous tools used by OpenERP.
 """
 
 from functools import wraps
-import inspect
 import subprocess
 import logging
 import os
+import random
 import re
-import smtplib
 import socket
 import sys
 import threading
@@ -40,13 +39,6 @@ import time
 import zipfile
 from collections import defaultdict
 from datetime import datetime
-from email.MIMEText import MIMEText
-from email.MIMEBase import MIMEBase
-from email.MIMEMultipart import MIMEMultipart
-from email.Header import Header
-from email.Utils import formatdate, COMMASPACE
-from email import Utils
-from email import Encoders
 from itertools import islice, izip
 from lxml import etree
 from which import which
@@ -363,7 +355,12 @@ def generate_tracking_message_id(res_id):
        Used to track the replies related to a given object thanks to the "In-Reply-To"
        or "References" fields that Mail User Agents will set.
     """
-    return "<%s-openerp-%s@%s>" % (time.time(), res_id, socket.gethostname())
+    try:
+        rnd = random.SystemRandom().random()
+    except NotImplementedError:
+        rnd = random.random()
+    rndstr = ("%.15f" % rnd)[2:] 
+    return "<%.15f.%s-openerp-%s@%s>" % (time.time(), rndstr, res_id, socket.gethostname())
 
 def email_send(email_from, email_to, subject, body, email_cc=None, email_bcc=None, reply_to=False,
                attachments=None, message_id=None, references=None, openobject_id=False, debug=False, subtype='plain', headers=None,