Public bug reported:

Binary package hint: thunderbird

Mails sent from Thunderbird which merely contain BCC entries generate a
TO: header in the de_AT.UTF8 locale like:

To: Verborgene_Empfaenger: ;

This header can be parsed by:
Microsoft Outlook Express 6.00.2900.3664
for example Outlook version:
Microsoft Office Outlook, Build 11.0.5510 
does not decode these mails correctly.

The the raw MIME format including all the headers are presented.
I'm not sure whether the To header must contain a valid address,

Evolution warns about an empty To: header invoking an Apparently-To:
header on some systems revealing the BCC recipients.  Maybe a warning
with the suggestion to add the sender as the To: recipient would satisfy
both cases.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: thunderbird 3.1.7+build3+nobinonly-0ubuntu0.10.04.1
ProcVersionSignature: Ubuntu 2.6.32-27.49-generic-pae 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Wed Jan 12 21:03:54 2011
ProcEnviron:
 LANG=de_AT.UTF-8
 SHELL=/bin/bash
SourcePackage: thunderbird

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 lucid

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https://bugs.launchpad.net/bugs/702097

Title:
  Some versions of Outlook misinterpret mails with only BCC recipients

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