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[dkim-ops] How do I know which header is breaking the signature

2009-11-06 08:38:37
My messages are being changed in transit  and so the signatures are
breaking. 
But I dont know which header is being changed 

Can I run something to tell me Signature invalid "header-X" has been
changed 



For eg this message has a broken DKIM  due to Content-Transfer-Encoding
( I found that out by trial and error)








Received: from darkstar.netcore.co.in (unknown [192.168.2.105]) by
        ho.netcore.co.in (Postfix) with ESMTPA id 3C2026CE04B3 for
        <ram(_at_)netcore(_dot_)co(_dot_)in>; Fri,  6 Nov 2009 12:09:40 +0530 
(IST)
Received: from location.exampledomain.com (list.netcore.co.in
        [192.168.40.94]) by darkstar.netcore.co.in (Postfix) with ESMTP
id
        8C9226680CB for <ram(_at_)netcore(_dot_)co(_dot_)in>; Fri,  6 Nov 2009 
12:09:36
+0530 (IST)
Received: from netcore.co.in (localhost [127.0.0.1]) by
        location.exampledomain.com (Postfix) with ESMTP id 76B6D52C1C1
for
        <ram(_at_)netcore(_dot_)co(_dot_)in>; Fri,  6 Nov 2009 12:09:34 +0530 
(IST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=netcore.co.in;
        s=default; t=1257489574; bh=GMfT7A4K07OPLdwXHEWtlS9++GG
+RNZCfRtWpuTr5yg=;
        h=MIME-Version:Content-Transfer-Encoding:Content-Type:Subject:
        Message-Id:To:Date:From;
        b=cSV+09TNvM01i4FR0ahZDCSMIdErr
+KoxOl8860JrEdodUMsDMOPnx8VsewlV6Ovf
        3ePE0IyfNPpggTzyn9EODmhCKQrVDujq1lMg2UvRYe5CKQSJVq68twGh
+gpYbLJi6+
        ff+STXh4Z4gqttY2Jyr7AfVAFoJcCbs1aQujVjXA=
MIME-Version: 1.0
Content-Disposition: inline
Content-Type: text/plain
X-Mailer: MIME::Lite 3.0105 (F2.74; T1.19; A1.76; B3.07; Q3.07)
Subject: Test Mail
Message-Id: <z8ux1gr9j5i3(_dot_)1257489574(_at_)netcore(_dot_)co(_dot_)in>
To: ram(_at_)netcore(_dot_)co(_dot_)in
Date: Fri, 06 Nov 2009 12:09:34 +0530
From: idcalerts(_at_)netcore(_dot_)co(_dot_)in
Content-Transfer-Encoding: 8bit

This is a Test Mail
Please Ignore


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