diff --git a/scripts/docker-send-email.py b/scripts/docker-send-email.py
index 3b1daebe0ba9fde1b3024d500c9185b9a9864b4b..cf9ddb75ec456bfe95a1e8c2c9617eed154ea886 100644
--- a/scripts/docker-send-email.py
+++ b/scripts/docker-send-email.py
@@ -10,7 +10,7 @@ message_body = r"""{
 "channel_id": "123",
 "message_body": "<p>Dear subscribers,</p>\n\n<p>This week news follows.&nbsp;</p>\n\n<p>&nbsp;</p>\n\n<p><strong>Topic 1</strong></p>\n\n<ul>\n\t<li>bla&nbsp;</li>\n\t<li>bla</li>\n\t<li>bla</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>Topic 2</strong></p>\n\n<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>\n\n<p>&nbsp;</p>\n\n<p>See you next week,</p>\n\n<p>Myself.</p>\n",
 "summary": "This week news!",
-"email": "user@cern.ch",
+"email": "emmanuel.ormancey@cern.ch",
 "created_at": "12/01/2021, 13:59:40",
 "notification_id": "bd19eea4-9dca-48d9-a577-5de9d2bf374a",
 "link": "http://toto.cern.ch",
diff --git a/vendor/django_mail/backends/smimesmtp.py b/vendor/django_mail/backends/smimesmtp.py
index fe05802007b80773297f475c806bb5e987c68d78..1689faf99f26b4c36d7462692db0fe5b90c37e44 100644
--- a/vendor/django_mail/backends/smimesmtp.py
+++ b/vendor/django_mail/backends/smimesmtp.py
@@ -180,5 +180,5 @@ class EmailBackend(BaseEmailBackend):
     def prepareSignedMessage(self, signed_message, boundary_text = "boundary"):
         """A method that converts the mail to bytes and fixes the broken header missing a newline."""
         return signed_message.as_bytes(linesep=smtplib.CRLF).replace(
-            b'; '+ str.encode(boundary_text), 
-            b';'+ str.encode(smtplib.CRLF) + b' ' + str.encode(boundary_text))
\ No newline at end of file
+            f'; {boundary_text}'.encode(),
+            f';{smtplib.CRLF} {boundary_text}'.encode())
\ No newline at end of file