diff --git a/source/courier-to-mailman3.py b/source/courier-to-mailman3.py
index d8357e5..1bbb3c7 100644
--- a/source/courier-to-mailman3.py
+++ b/source/courier-to-mailman3.py
@@ -27,6 +27,7 @@ try:
     import sys
     import smtplib
     from email.parser import HeaderParser
+    import pprint
 
     logger.info('Starting Logging (inside try)')
 
@@ -48,7 +49,7 @@ try:
         #content = content.replace(b'\r\n', b'\n').replace(b'\r', b'\n').replace(b'\n', b'\r\n')
         header = content.strip()
         headers = dict(HeaderParser().parsestr(header.decode('utf-8')))
-        header_to = headers[To]
+        header_to = headers['To']
 
         # See <https://qmail.notqmail.org/qmail-manual-html/man8/qmail-command.html>
         # for qmail command docs and supplied environment variables.