import re
txt = """From nobody Mon Jun 13 12:55:01 2016
Sun Jun 12 19:15:36 2016
X-Apparently-To: test@yahoo.com; Thu, 09 Jun 2016 15:13:13 +0000
Return-Path: <0102015535b9672b-90ed3c8d-2de5-4a0c-91ab-6be115c1d1cb-000000@eu-west-1.amazonses.com>
Received-SPF: pass (domain of eu-west-1.amazonses.com designates 54.240.6.83 as permitted sender)
X-YMailISG: C6MBezYWLDs2qYldVhAp9ZvDxc8qFBIkj1mK6ePPJkd9GNiL
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X-Originating-IP: [54.240.6.83]
Authentication-Results: mta1479.mail.bf1.yahoo.com from=mutualart.com; domainkeys=neutral (no sig); from=amazonses.com; dkim=pass (ok)
Received: from 127.0.0.1 (EHLO a6-83.smtp-out.eu-west-1.amazonses.com) (54.240.6.83)
by mta1479.mail.bf1.yahoo.com with SMTPS; Thu, 09 Jun 2016 15:13:13 +0000
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple;
s=ihchhvubuqgjsxyuhssfvqohv7z3u4hn; d=amazonses.com; t=1465485191;
h=List-Unsubscribe:MIME-Version:From:To:Date:Subject:Content-Type:Content-Transfer-Encoding:Message-ID:Feedback-ID;
bh=cbWXMjH92E8G/sjRAMvI/6czD2YqEGBj9a+w8ZXC4rY=;
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List-Unsubscribe: <mailto:support@mutualart.com?subject=Unsubscribe User
from Welcome>
X-Complaints-To: support@mutualart.com
MIME-Version: 1.0
From: "MutualArt.com" <noreply@mutualart.com>
To: test@yahoo.com
Date: Thu, 9 Jun 2016 15:13:11 +0000
Subject: Special way to say Welcome to MutualArt.com
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64
Message-ID: <0102015535b9672b-90ed3c8d-2de5-4a0c-91ab-6be115c1d1cb-000000@eu-west-1.amazonses.com>
X-SES-Outgoing: 2016.06.09-54.240.6.83
Feedback-ID: 1.eu-west-1.aFTitmoRCrSI1KPaWZP932YahjX5wxvNB2k+aQfeSb8=:AmazonSES
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values = []
start_matching = False
val = ""
for line in txt.split("\n"):
if re.match(r"[^\s:]+:\s", line.strip()):
start_matching = True
if val:
values.append(val)
val = ""
val += re.sub(r"^[^\s:]+:\s", "", line.strip())
else:
if start_matching:
val += "{}\n".format(line.strip())
print(values)