From 6c42872440c7dd18de7087014d4cce4f0fbb56c7 Mon Sep 17 00:00:00 2001
From: Son <nguyenkims@users.noreply.github.com>
Date: Wed, 5 Jan 2022 15:22:22 +0100
Subject: [PATCH] add is_bounce()

---
 email_handler.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/email_handler.py b/email_handler.py
index 4b424128..10f8c296 100644
--- a/email_handler.py
+++ b/email_handler.py
@@ -1771,6 +1771,14 @@ def is_automatic_out_of_office(msg: Message) -> bool:
     return False
 
 
+def is_bounce(envelope: Envelope, msg: Message):
+    """Detect whether an email is a Delivery Status Notification"""
+    return (
+        envelope.mail_from == "<>"
+        and msg.get_content_type().lower() == "multipart/report"
+    )
+
+
 def handle_unsubscribe(envelope: Envelope, msg: Message) -> str:
     """return the SMTP status"""
     # format: alias_id: