# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1411494674 -7200
# Node ID 4f2c6bcd8c3905427ed08ac12232dccf918fa9f7
# Parent  d59a3cba2e30d9590c61107d066198db74a2630e
Added descriptive aspects to sent mail messages.

diff -r d59a3cba2e30 -r 4f2c6bcd8c39 imip_agent.py
--- a/imip_agent.py	Tue Sep 23 17:32:22 2014 +0200
+++ b/imip_agent.py	Tue Sep 23 19:51:14 2014 +0200
@@ -16,6 +16,12 @@
 
 OWNER = "resource+manager@example.com"
 
+MESSAGE_SUBJECT = "Calendar system message"
+
+MESSAGE_TEXT = """\
+This is a response to a calendar message sent by your calendar program.
+"""
+
 # Postfix exit codes.
 
 EX_USAGE        = 64
@@ -155,14 +161,15 @@
     # Pack the parts into a single message.
 
     if all_parts:
-        if len(all_parts) > 1:
-            message = MIMEMultipart("alternative", _subparts=all_parts)
-        else:
-            message = all_parts[0]
+        text_part = MIMEText(MESSAGE_TEXT)
+        all_parts.insert(0, text_part)
+        message = MIMEMultipart("alternative", _subparts=all_parts)
+        message.preamble = MESSAGE_TEXT
 
         message["From"] = OWNER
         for sender in senders:
             message["To"] = sender
+        message["Subject"] = MESSAGE_SUBJECT
 
         if "-d" in sys.argv:
             print message