[imp] Base64-only message not quoted in reply

[Robin Bankhead]

Hi,

Didn't want to ticket this automatically in case it's put down to bad  
message format (I'm no expert but this seems a common reply to such  
issues).

The (redacted) message below is all base64-encoded text/plain and has  
no plaintext part.  It views fine, but when replying to it, it is not  
quoted.  We have no issues with the original HTML + quoted-printable  
messages from the same sender, but their replies to our replies always  
come in this base64-only format (I wonder if their Barracuda spam  
firewall is doing this?)

The message is below; sorry it is quite heavily snipped but it is  
privileged business stuff; I'll try to recreate it if necessary.

Regards,
Robin Bankhead

---------------------------
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on aye
X-Spam-Level:
X-Spam-Status: No, score=-0.2 required=5.0 tests=AWL,BAYES_00,RDNS_NONE
	autolearn=no version=3.3.2
Received: from EQVIP.tbr.inty.net [91.221.168.148]
	by aye with POP3 (fetchmail-6.3.21)
	for <lyal at localhost> (single-drop); Thu, 09 Jan 2014 07:33:05 +0000 (GMT)
Received: from smtp.demon.co.uk (192.168.70.15) by HVUT04.thus.corp
  (192.168.70.44) with Microsoft SMTP Server (TLS) id 14.3.158.1; Thu, 9 Jan
  2014 07:34:15 +0000
X-ASG-Debug-ID: 1389252749-02a8c11af42e460001-qu9AEe
X-Barracuda-Envelope-From:
X-Barracuda-RBL-Trusted-Forwarder: 192.168.0.198
From:
X-Barracuda-BWL-IP: fe80::f5ff:2cda:57ae:2e0d
To:
Subject:
Thread-Topic:
X-ASG-Orig-Subj:
Thread-Index: Ac8MTgIzLDGFx7t8SdWTQXjlftD97wASrxyAAB0G7bA=
Date: Thu, 9 Jan 2014 07:32:29 +0000
Message-ID: <D538EE2E378AB64EA6E21E2BD3A05A47010A34192A at APPMAIL2.cts.local>
References: <D538EE2E378AB64EA6E21E2BD3A05A47010A3413CC at APPMAIL2.cts.local>
  <20140108184039.Horde.WijryeDLh20XTBGVpr8Kgg2 at naw>
In-Reply-To: <20140108184039.Horde.WijryeDLh20XTBGVpr8Kgg2 at naw>
Accept-Language: de-DE, en-US
Content-Language: de-DE
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [192.168.0.21]
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
X-Barracuda-Connect: appmail1.cts.local[192.168.0.198]
X-Barracuda-Start-Time: 1389252749
X-Barracuda-URL: http://192.168.0.176:8000/cgi-mod/mark.cgi
X-Virus-Scanned: by bsmtpd at
X-Barracuda-BRTS-Status: 1
X-Barracuda-BRTS-Evidence:
X-Barracuda-Spam-Score: 0.00
X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of  
TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=9.0 tests=
X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.143896
	Rule breakdown below
	 pts rule name              description
	---- ----------------------  
--------------------------------------------------
X-Provags-ID: V02:K0:Bqq2c6fUcr9BLlXduyNqHi49n34i9yzXU/cGhf7Nsxx
  vdyIigyu7RX3/oqej7k8YOfJrZ0/D41BTPTPAo6eITBGnao2Fe
  zhxMiGxuHf7KPj2vmg6168VX9oirobveOfGVnH9Z7vVi3dOhu2
  WWC1YIK7vX99Hkq4QxFG1oGR2x1nWOmdKmdc9aj7zskIvT/+ze
  N0pwUm1Ekks2i+UxGTvgIAuxXXDvNvAWWLZOg6+KeswUoQ9dWJ
  0YxaB4Fr8/DkAfRy3hwAlf35I+AbtG7RLHFLVyc4dJv3HkwmUg
  SZa32aV7OwYQjG77E/2OK1dbYys9tnuCG4L1zh1+XMW3GVnNBJ
  AWTFLjoxBzleXfJD7uxfgH+DI8/GmIO/nBR/XipUkR0FMmqEwf
  GKNNikClD2aO3en5hZo1S0j2HVzgo9FnzzwUROuSlRkdFTmUeE
  njIo8
X-MDF-HostID: 25
Return-Path:
X-MS-Exchange-Organization-AuthSource: HVUT04.thus.corp
X-MS-Exchange-Organization-AuthAs: Anonymous
MIME-Version: 1.0
X-Virus-Status: No
X-Virus-Checker-Version: clamassassin 1.2.4 with clamdscan / ClamAV  
0.97.8/18329/Thu Jan  9 06:15:42 2014

RGVhciBBbGlzb24sDQoNCmhhcHB5IG5ldyB5ZWFyIHRvIHlvdSAsIHRvbyENCg0KUGxlYXNlZCB0
byByZWNvbmZpcm0hDQoNCldpdGggYmVzdCByZWdhcmRzDQpG
---------------------
[rest of base64 message snipped; it was 86 lines and confidential]