IMAP Gateway: error displaying email containing 2 linebreaks between multiparts

[FuePi]

The following mail (edited for privacy) generates an error:

Received: from topalis.com ([192.168.10.5])
          by notes-001.str.topalis (Lotus Domino Release 8.0.1HF110)
          with ESMTP id 2009070311592478-85853 ;
          Fri, 3 Jul 2009 11:59:24 +0200
Received: from [192.168.10.xxx] (lt-xx.topalis [192.168.10.xxx])
 by topalis.com (Postfix) with ESMTP id 8EAC5BC06E
 for <email address hidden>; Fri, 3 Jul 2009 11:59:24 +0200 (CEST)
Message-ID: <email address hidden>
Date: Fri, 03 Jul 2009 11:59:19 +0200
From: xxxxxxxxx xxxx <email address hidden>
To: Holger Widmann <email address hidden>
Subject: lustiger inhalt
Content-Type: multipart/signed; micalg=pgp-sha1;
 protocol="application/pgp-signature";
 boundary="------------enigAC5B1DAA975780148A3B4A98"
User-Agent: Thunderbird 2.0.0.22 (X11/20090630)
MIME-Version: 1.0
X-Enigmail-Version: 0.95.7
X-MIMETrack: Itemize by SMTP Server on notes-001/Server/Topalis(Release 8.0.1HF110 | April
 11, 2008) at 03.07.2009 11:59:24

--------------enigAC5B1DAA975780148A3B4A98
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

--=20
------------------------------------------------------------------------
xxxxxxxxx xxxx

InnoviData GmbH Tel. [phone]-xxx
Lilienthalstra=DFe 2/1 Fax [phone]-xxx
70825 Korntal/Stuttgart Cel. +49 xxx xxxxxxx
http://www.innovidata.com <email address hidden>

Gesch=E4ftsf=FChrer: Thomas Uhl
Sitz und Amtsgericht Stuttgart, HRB 21082
------------------------------------------------------------------------

--------------enigAC5B1DAA975780148A3B4A98
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.11 (GNU/Linux)

iEYxARECxAYFAkpN1nsACgkQ/1lz2uhDN5acTwCgjiBRHOgZkdwx0CCCM5Ga7LTs
ltEAn1sw4EWfyx2MbkcfAQBD+RVgbib9
=6Mxl
-----END PGP SIGNATURE-----

--------------enigAC5B1DAA975780148A3B4A98--

20090703-121139.598|| 24||demo1||12 Response8
20090703-121139.648|| 24||demo1||sldkfj
20090703-121139.649|| 24||demo1||C: 13 UID fetch 4 (UID RFC822.SIZE FLAGS BODY.PEEK[HEADER.FIELDS (From To Cc Subject Date Message-ID Priority X-Priority References Newsgroups In-Reply-To Content-Type)])
20090703-121139.650|| 24||demo1||command processing: "FETCH"
20090703-121139.653|| 24||demo1||GetNamedProp 1
20090703-121139.653|| 24||demo1||GetNamedProp 2. name=openmapi-message-UID
20090703-121139.653|| 24||demo1||GetNamedProp 2. guid=NMapi.NMapiGuid
20090703-121139.653|| 24||demo1||GetNamedProp 2. type=Long
20090703-121139.654|| 24||demo1||GetNamedProp 3. Tag=-2146893814
20090703-121139.655|| 24||demo1||GetNamedProp 4
20090703-121139.655|| 24||demo1||GetNamedProp 5
20090703-121139.655|| 24||demo1||GetNamedProp 6, PropType:NMapi.Properties.IntProperty
20090703-121139.708|| 24||demo1||13 Response1
20090703-121139.708|| 24||demo1||13 Response2
20090703-121139.708|| 24||demo1||13 Response3
20090703-121139.708|| 24||demo1||13 Response7
20090703-121139.708|| 24||demo1||S: 13 NO FETCH Missing boundary parameter

20090703-121139.708|| 24||demo1||13 Response8
20090703-121139.708|| 24||demo1|| at NMapi.Format.Mime.MimePart.get_Boundary () [0x00030] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimePart.cs:289
  at NMapi.Format.Mime.MimeMultipart..ctor (NMapi.Format.Mime.MimePart mp) [0x0002a] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimeMultipart.cs:57
  at NMapi.Format.Mime.MimePart.get_Content () [0x0013b] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimePart.cs:346
  at NMapi.Format.Mime.MimeBodyPart.get_Content () [0x00000] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimeBodyPart.cs:86
  at NMapi.Format.Mime.MimeBodyPart.WriteTo (System.IO.Stream os) [0x0005a] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimeBodyPart.cs:262
  at NMapi.Format.Mime.MimeMultipart.WriteTo (System.IO.Stream os) [0x00085] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimeMultipart.cs:213
  at NMapi.Format.Mime.MimePart.WriteBodyTo (System.IO.Stream os) [0x00049] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimePart.cs:461
  at NMapi.Format.Mime.MimePart.WriteTo (System.IO.Stream os) [0x00007] in /home/install/OpenMapi.org/nmapi/NMapi/Format/Mime/MimePart.cs:475
  at NMapi.Gateways.IMAP.CmdFetch.BuildFetchResponseRow (NMapi.Gateways.IMAP.Command command, NMapi.Gateways.IMAP.SequenceNumberListItem snli, NMapi.Table.Row rowProperties) [0x001f3] in /home/install/OpenMapi.org/nmapi/gateways/imap/commands/CmdFetch.cs:182
  at NMapi.Gateways.IMAP.CmdFetch.DoFetchLoop (NMapi.Gateways.IMAP.Command command) [0x00198] in /home/install/OpenMapi.org/nmapi/gateways/imap/commands/CmdFetch.cs:123
  at NMapi.Gateways.IMAP.CmdFetch.Run (NMapi.Gateways.IMAP.Command command) [0x00005] in /home/install/OpenMapi.org/nmapi/gateways/imap/commands/CmdFetch.cs:64

[Andreas Hügel (andreas-huegel)]

there are 2 possibilities:

1. Outlook 2007 is doing something wrong.
argument for this possibility:
* there is one single attachment to the email (which is ok)
* that attachment has a AttachMimeTag with the value "multipart/signed" which actually describes the message in whole rather than the attachment
* Outlook 2003 cannot display the text nor the attachment of the email

2. Outlook 2007 is storing data differently
* the size of the attachment in the email is greater than 1800 Bytes. The actual size of the signature is well below 300 Bytes.
* Outlook 2007 can open and display the email correctly