Using ezcMailAddress with specific charset can break final Mail headers

When using ezcMailAddress with a charset other than us-ascii (let's say "utf-8") for a sender with a name having accents (also valid for cc, bcc and receiver), ezcMailTools::composeEmailAddress() does the encoding via iconv_mime_encode(). This operation eventually adds a line break (\r\n) if generated name is too long (exceeding 76 chars).
Problem is that this operation is done a 2nd time in ezcMailPart::generateHeaders(), potentially introducing a new line break. This completely messes up the mail headers and can end with something like that :

From: =?utf-8?Q?mailTest=C3=A4=C3=B6=C3=BC=20mail?==?utf-8?Q?Test?=

 =?utf-8?Q?=C3=A4=C3=B6=C3=BC?= <jv@ez.no>
To: Test mail <jv+test@ez.no>
Subject: =?utf-8?Q?This=20is=20a=20test=20H=C3=A9h?==?utf-8?Q?=C3=A9=C3=B6?=
 =?utf-8?Q?=C3=AF=C3=BB$=C3=B9=20@=C3=A8=C3=AA=C3=AB=C3=B8?=
MIME-Version: 1.0
User-Agent: eZ Components
Date: Tue, 03 Jan 2012 14:56:21 +0100
Message-Id: <201201031414321.21215.0@ez.no>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

Here the From header is completely broken.
The original sender name is "mailTestäöüß mailTestäöüß"