From 1ea9f19d78a67b2f914c7b62b220f9bdeb08a5dc Mon Sep 17 00:00:00 2001
From: r350178982 <32759763+r350178982@users.noreply.github.com>
Date: Sat, 19 Apr 2025 16:24:50 +0800
Subject: [PATCH] Update mail.py

---
 seahub/utils/mail.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/seahub/utils/mail.py b/seahub/utils/mail.py
index 52ffb2a037..6cade5f6df 100644
--- a/seahub/utils/mail.py
+++ b/seahub/utils/mail.py
@@ -40,6 +40,8 @@ def add_smime_sign(msg):
     # Load the certificate
     with open(cert_file, "rb") as f:
         certificate = x509.load_pem_x509_certificate(f.read())
+
+    msg.mixed_subtype = "signed"
     
     msg_payload = msg.message().as_string().encode()