[Python] python email.message_from_string() parse problems

My setup uses fetchmail to pull emails from Gmail, which are processed by procmail and passed to a Python script.

When I use email.message_from_string(), the resulting object is not parsed as an email object. get_payload() returns the header/body/payload text of the email as a single text blob.

This is the text it returns:

From example@gmail.com Sat Aug 17 19:20:44 2013
>From example Sat Aug 17 19:20:44 2013
MIME-Version: 1.0
Received: from ie-in-f109.1e100.net [74.125.142.109]
by VirtualBox with IMAP (fetchmail-6.3.21)
for <example@localhost> (single-drop); Sat, 17 Aug 2013 19:20:44 -0700 (PDT)
Received: by 10.70.131.110 with HTTP; Sat, 17 Aug 2013 19:20:42 -0700 (PDT)
Date: Sat, 17 Aug 2013 19:20:42 -0700
Delivered-To: example@gmail.com
Message-ID: <CAAsp4m0GBeVg80-ryFgNvNNAj_QPguzbX3DqvMSx-xSGZM18Pw@mail.gmail.com>
Subject: test 19:20
From: example <example@gmail.com>
To: example <example@gmail.com>
Content-Type: multipart/alternative; boundary=001a1133435474449004e42f7861

--001a1133435474449004e42f7861
Content-Type: text/plain; charset=ISO-8859-1

19:20

--001a1133435474449004e42f7861
Content-Type: text/html; charset=ISO-8859-1

<div dir="ltr">19:20</div>

--001a1133435474449004e42f7861--


My code:

full_msg = sys.stdin.read()
msg = email.message_from_string(full_msg)
msg['to'] # returns None
msg.get_payload() # returns the text above


What am I missing in getting Python to properly interpret the email?

I see from these questions that I may not be getting the proper email headers somewhere along the line, but I cannot confirm. That > on line 2 is not a typo: it's in the text.

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