diff --git a/addons/mass_mailing/models/mail_mail.py b/addons/mass_mailing/models/mail_mail.py
index e27156e74d5..a67f88a2a28 100644
--- a/addons/mass_mailing/models/mail_mail.py
+++ b/addons/mass_mailing/models/mail_mail.py
@@ -83,8 +83,8 @@ class MailMail(osv.Model):
 
     def send_get_email_dict(self, cr, uid, mail, partner=None, context=None):
         res = super(MailMail, self).send_get_email_dict(cr, uid, mail, partner, context=context)
-        if mail.mailing_id and res.get('body'):
-            email_to = tools.email_split(res.get('email_to'))
+        if mail.mailing_id and res.get('body') and res.get('email_to'):
+            email_to = tools.email_split(res.get('email_to')[0])
             unsubscribe_url = self._get_unsubscribe_url(cr, uid, mail, email_to, context=context)
             if unsubscribe_url:
                 res['body'] = tools.append_content_to_html(res['body'], unsubscribe_url, plaintext=False, container_tag='p')