From 754bd4964c0ff6db09e6f423f23d1d4e4debe117 Mon Sep 17 00:00:00 2001
From: Son <nguyenkims@users.noreply.github.com>
Date: Tue, 5 Apr 2022 11:56:45 +0200
Subject: [PATCH] Set CONTENT_TRANSFER_ENCODING if absent

---
 email_handler.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/email_handler.py b/email_handler.py
index e772406f..3286b9d8 100644
--- a/email_handler.py
+++ b/email_handler.py
@@ -2223,6 +2223,11 @@ def handle(envelope: Envelope, msg: Message) -> str:
     envelope.mail_from = mail_from
     envelope.rcpt_tos = rcpt_tos
 
+    # some emails don't have this header, set the default value (7bit) in this case
+    if headers.CONTENT_TRANSFER_ENCODING not in msg:
+        LOG.i("Set CONTENT_TRANSFER_ENCODING")
+        msg[headers.CONTENT_TRANSFER_ENCODING] = "7bit"
+
     postfix_queue_id = get_queue_id(msg)
     if postfix_queue_id:
         set_message_id(postfix_queue_id)