Mails sent from roundup contain duplicate headers.

To: ...
Subject: INVALID HEADER in mail TO YOU from <roundup-admin@tryton.org>
Date: Thu, 19 Feb 2015 08:06:59 +0000 (UTC)



Our content checker found
    Duplicate header field: "Reply-To"
    Duplicate header field: "Message-ID"


in an email to you from:
  roundup-admin@tryton.org

Content type: BadHdrDupl
Our internal reference code for your message is 01019-04/QweNCjtxuziY

First upstream SMTP client IP address: [94.23.24.155] moretus.b2ck.com
According to a 'Received:' trace, the message apparently originated at:
  [94.23.24.155], moretus.b2ck.com moretus.b2ck.com [IPv6:::1]


We fixed that on our roundup (1.4) since considerable time with the
patch in http://codereview.tryton.org/11001002 and it works without
errors to our knowledge.