diff --git a/src/clover_email/send_email.py b/src/clover_email/send_email.py
index 17dba6e..d9a642d 100644
--- a/src/clover_email/send_email.py
+++ b/src/clover_email/send_email.py
@@ -196,6 +196,7 @@ async def send_email_by_server(receiver_email: str, file_path: str):
     msg = MIMEMultipart()
     msg["From"] = server_email
     msg["To"] = receiver_email
+    msg["X-No-AddSig"] = "1"
     msg["Subject"] = "您的快递已送达"
     msg.attach(MIMEText(html, "html", "utf-8"))