diff --git a/addons/mass_mailing/models/mail_mail.py b/addons/mass_mailing/models/mail_mail.py
index de7ca9b2cfa..d6a49b612b6 100644
--- a/addons/mass_mailing/models/mail_mail.py
+++ b/addons/mass_mailing/models/mail_mail.py
@@ -87,12 +87,12 @@ class MailMail(models.Model):
     def send_get_email_dict(self, partner=None):
         # TDE: temporary addition (mail was parameter) due to semi-new-API
         res = super(MailMail, self).send_get_email_dict(partner)
-        base_url = self.env['ir.config_parameter'].get_param('web.base.url')
+        base_url = self.env['ir.config_parameter'].get_param('web.base.url').rstrip('/')
         if self.mailing_id and res.get('body') and res.get('email_to'):
             emails = tools.email_split(res.get('email_to')[0])
             email_to = emails and emails[0] or False
             unsubscribe_url = self._get_unsubscribe_url(email_to)
-            link_to_replace =  base_url+'/unsubscribe_from_list'
+            link_to_replace = base_url + '/unsubscribe_from_list'
             if link_to_replace in res['body']:
                 res['body'] = res['body'].replace(link_to_replace, unsubscribe_url if unsubscribe_url else '#')
         return res