remove subject from delta chat messsages

email2post.py

@@ -62,11 +62,18 @@ def parse(data, pnut, mstdn):
         msg.append(line)
     body = '\n'.join(msg)
 
+    deltac = data.get('Chat-Version')
+    if deltac is None:
+        subject = data['Subject']
+    else:
+        logger.debug(f"Chat-Version: {deltac}")
+        subject = ""
+
     if pnut:
-        post_pnut(data['Subject'], body, attachments)
+        post_pnut(subject, body, attachments)
 
     if mstdn:
-        post_mastodon(data['Subject'], body, attachments)
+        post_mastodon(subject, body, attachments)
 
 def post_pnut(title, text, attachments):
     post = {'text': text, 'raw': []}