Better escaping for mail header with formataddr method

tracim/tracim/lib/email.py

 from email.message import Message
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
+from email.utils import formataddr
 
 from mako.template import Template
 from tg.i18n import ugettext as _
             )
         message = MIMEMultipart('alternative')
         message['Subject'] = subject
-        message['From'] = '{0} <{1}>'.format(
+        message['From'] = formataddr((
             self._global_config.EMAIL_NOTIFICATION_FROM_DEFAULT_LABEL,
-            self._global_config.EMAIL_NOTIFICATION_FROM_EMAIL,
+            self._global_config.EMAIL_NOTIFICATION_FROM_EMAIL)
         )
-        message['To'] = user.email
+        message['To'] = formataddr(('',user.email))
 
         text_template_file_path = self._global_config.EMAIL_NOTIFICATION_CREATED_ACCOUNT_TEMPLATE_TEXT  # nopep8
         html_template_file_path = self._global_config.EMAIL_NOTIFICATION_CREATED_ACCOUNT_TEMPLATE_HTML  # nopep8

tracim/tracim/lib/notifications.py

 from email.header import Header
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
+from email.utils import formataddr
 
 from lxml.html.diff import htmldiff
 
         else:
             email_address = email_template.replace('{user_id}', '0')
 
-        return '{label} <{email_address}>'.format(
-            label = Header(mail_sender_name).encode(),
-            email_address = email_address
-        )
+        return formataddr((mail_sender_name,email_address))
 
     @staticmethod
     def log_notification(
 
         for role in notifiable_roles:
             logger.info(self, 'Sending email to {}'.format(role.user.email))
-            to_addr = '{name} <{email}>'.format(name=role.user.display_name, email=role.user.email)
+            to_addr = formataddr((role.user.display_name,role.user.email))
 
             #
             #  INFO - D.A. - 2014-11-06