From a28c90f110f5392e37a838bbb6ed0a9c911c7ef4 Mon Sep 17 00:00:00 2001
From: Son NK <nguyenkims@hotmail.com>
Date: Tue, 19 Nov 2019 00:16:57 +0100
Subject: [PATCH] Change subject to let user know the email is forwarded from
 SL

---
 email_handler.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/email_handler.py b/email_handler.py
index bc8d9127..4ab50ab7 100644
--- a/email_handler.py
+++ b/email_handler.py
@@ -126,6 +126,12 @@ class MailHandler:
                     except ValueError:
                         # the header exists already
                         msg.replace_header("Reply-To", forward_email.reply_email)
+                    # modify subject to let user know the email is forwarded from SL
+                    original_subject = msg["Subject"]
+                    msg.replace_header(
+                        "Subject",
+                        f"Forwarded by SimpleLogin. Subject: {original_subject}. From: {website_email}",
+                    )
 
                     LOG.d(
                         "Send mail from %s to %s, mail_options %s, rcpt_options %s ",