From e335ae7d5216c8841b34161e4f1c936cbf0e2761 Mon Sep 17 00:00:00 2001
From: Son NK <nguyenkims@hotmail.com>
Date: Thu, 14 Nov 2019 17:35:29 +0100
Subject: [PATCH] fix replace_header

---
 email_handler.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/email_handler.py b/email_handler.py
index f4a96b23..f0044df8 100644
--- a/email_handler.py
+++ b/email_handler.py
@@ -114,7 +114,11 @@ class MailHandler:
 
                 # add custom header
                 msg.add_header("X-SimpleLogin-Type", "Forward")
-                msg.replace_header("Reply-To", forward_email.reply_email)
+                try:
+                    msg.add_header("Reply-To", forward_email.reply_email)
+                except ValueError:
+                    # the header exists already
+                    msg.replace_header("Reply-To", forward_email.reply_email)
 
                 LOG.d(
                     "Send mail from %s to %s, mail_options %s, rcpt_options %s ",