markup email handle encoded headers

markup/email.py

@@ -5,6 +5,8 @@ import smtplib
 from pathlib import Path
 from mailbox import Maildir
 from email.message import EmailMessage
+from email.utils import formatdate
+from email.header import Header, make_header
 
 import logging
 log = logging.getLogger(__name__)
@@ -59,11 +61,14 @@ def send(frm, subj, msg):
     msg['From'] = 'Keen ProCatalog Markup Bot <support@procatalog.io>'
     msg['To'] = frm
     msg['Bcc'] = 'alx-markup@procatalog.io'
-    msg['Subject'] = f'Re: {subj}'
+
+    subj = f'Re: {subj}'
+    msg['Subject'] = Header(subj).encode()
+
     msg['Message-ID'] = msgid()
 
     maildir = Maildir('/tmp/markup_submit_mail')
-    maildir.add(msg)
+    maildir.add(msg.as_bytes())
 
     log.info(f'sending email to "{frm}": {subj}')