--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/messages/utils.py	Sat May 05 17:10:48 2012 -0500
@@ -0,0 +1,16 @@
+"""
+This file contains various helper utility functions for the messages
+application.
+
+"""
+
+
+def reply_subject(subject):
+    """
+    Builds a subject line for a reply.
+    If the subject already starts with Re: then return the subject.
+    Otherwise, prepend Re: to the subject and return it.
+    """
+    if subject.startswith('Re: '):
+        return subject
+    return 'Re: ' + subject