Cuted subject of automatic replay?

When I send to RT an email(for example in ISO-8859-2) with subject which has all polish specific letters: ŻŹĆŃŁĄŚÓĘżźćńłąśóę, RT sends me automatic replay and when I reciving it under Mozilla Thunderbird subject looks like it has been cuted. Whole email pasted below:

From - Thu Apr 05 15:22:13 2007
X-Account-Key: account2
X-UIDL: ?(7"!“\c”!@5%“!-$-”!
X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
Return-Path: www-data@bablalbalbla
X-Spam-Checker-Version: SpamAssassin 3.1.7 (2006-10-05) on
X-Spam-Status: No, score=-0.1 required=5.0 tests=ALL_TRUSTED,AWL,
SUBJECT_ENCODED_TWICE autolearn=no version=3.1.7
X-Original-To: tom@balblablalba
Delivered-To: tom@blablablabla
Received: from localhost (localhost [])
by blablablabl (Postfix) with ESMTP id E0D381C024BD3
for tom@blablablabl; Thu, 5 Apr 2007 15:21:49 +0200 (CEST)
X-Virus-Scanned: Debian amavisd-new at blablablalb
Received: from abllablabla ([])
by localhost (blablalbalba []) (amavisd-new, port 10024)
with ESMTP id JMWYM1xbqcUz for tom@ablablalblaba;
Thu, 5 Apr 2007 15:21:49 +0200 (CEST)
Received: from balbalblab (unknown [])
by balblalblab (Postfix) with ESMTP id B57B31C024B79
for tom@balblalbab; Thu, 5 Apr 2007 15:21:49 +0200 (CEST)
Received: by blablalbalba (Postfix, from userid 33)
id 9E9A2801CD; Thu, 5 Apr 2007 15:21:49 +0200 (CEST)Subject: =?UTF-8?B?W0lEICM3NV0gQXV0b1JlcGx5OiDFu8W5xIbFg8WBw5PEhMWaxJjFvMW6xIfF?= =?UTF-8?B?hMWCw7PEhcWbxJk=?=
From: “The default queue via RT” RT_CorrespondAddressNotSet@blablalbablabla
Reply-To: RT_CorrespondAddressNotSet@blablablablab
In-Reply-To: 00c001c77785$67db9cf0$2ef0a8c0@Tom
References: 00c001c77785$67db9cf0$2ef0a8c0@Tom
Precedence: bulk
X-RT-Loop-Prevention: ID
RT-Ticket: ID #75
Managed-by: RT 3.6.3 (Request Tracker — Best Practical Solutions)
RT-Originator: tom@blalala
To: tom@blablab
MIME-Version: 1.0
Content-Type: text/plain; charset=“utf-8”
Content-Transfer-Encoding: 8bit
X-RT-Original-Encoding: utf-8
Date: Thu, 05 Apr 2007 15:21:49 +0200
X-UIDL: ?(7"!“\c”!@5%“!-$-”!


This message has been automatically generated in response to the
creation of a trouble ticket regarding:
a summary of which appears below.

There is no need to reply to this message right now. Your ticket has been
assigned an ID of [ID #75].

Please include the string:

     [ID #75]

in the subject line of all future correspondence about this issue. To do so,
you may reply to this message.

                    Thank you,