[Python] How can I parse an email header with python?

Here's an example email header,

header = """
From: Media Temple user (mt.kb.user@gmail.com)
Subject: article: A sample header
Date: January 25, 2011 3:30:58 PM PDT
To: user@example.com
Return-Path: <mt.kb.user@gmail.com>
Envelope-To: user@example.com
Delivery-Date: Tue, 25 Jan 2011 15:31:01 -0700
Received: from o-out-1718.google.com ([72.14.252.155]:54907) by cl35.gs01.gridserver.com with esmtp (Exim 4.63) (envelope-from <mt.kb.user@gmail.com>) id 1KDoNH-0000f0-RL for user@example.com; Tue, 25 Jan 2011 15:31:01 -0700
Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type; bh=+JqkmVt+sHDFIGX5jKp3oP18LQf10VQjAmZAKl1lspY=; b=F87jySDZnMayyitVxLdHcQNL073DytKRyrRh84GNsI24IRNakn0oOfrC2luliNvdea LGTk3adIrzt+N96GyMseWz8T9xE6O/sAI16db48q4Iqkd7uOiDvFsvS3CUQlNhybNw8m CH/o8eELTN0zbSbn5Trp0dkRYXhMX8FTAwrH0=
Domainkey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=wkbBj0M8NCUlboI6idKooejg0sL2ms7fDPe1tHUkR9Ht0qr5lAJX4q9PMVJeyjWalH 36n4qGLtC2euBJY070bVra8IBB9FeDEW9C35BC1vuPT5XyucCm0hulbE86+uiUTXCkaB 6ykquzQGCer7xPAcMJqVfXDkHo3H61HM9oCQM=
Message-Id: <c8f49cec0807011530k11196ad4p7cb4b9420f2ae752@mail.gmail.com>
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="----=_Part_3927_12044027.1214951458678"
X-Spam-Status: score=3.7 tests=DNS_FROM_RFC_POST, HTML_00_10, HTML_MESSAGE, HTML_SHORT_LENGTH version=3.1.7
X-Spam-Level: ***
Message Body: **The email message body**
"""


The header is stored as a string, how do I parse this header, so that i can map it to a dictionary as the header fields be the key and the values be the values in the dictionary?

I want a dictionary like this,

header_dict = {
'From': 'Media Temple user (mt.kb.user@gmail.com)',
'Subject': article: 'A sample header',
'Date': 'January 25, 2011 3:30:58 PM PDT'
'and so on': .. . . . .. . . .. .
. . . . .. . . . .. . . . . .
}


I made a list of fields required,

header_reqd = ['From:','Subject:','Date:','To:','Return-Path:','Envelope-To:','Delivery-Date:','Received:','Dkim-Signature:','Domainkey-Signature:','Message-Id:','Mime-Version:','Content-Type:','X-Spam-Status:','X-Spam-Level:','Message Body:']


This can list items can likely be the keys for the dictionary.

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