Is this what you mean? Email sent FROM a hotmail-address TO the email-address using osTicket.
From: "A"
To: "xxxx.se "
Subject: =?iso-8859-1?B?5eT2?=
Date: Thu, 2 Oct 2008 22 +0200
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_01B2_01C924DE.3A75AD20"
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
X-Mailer: Microsoft Windows Live Mail 12.0.1606
X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606
Subject: åäö
Message: åäö
Message was shown correctly in osTicket, but the subject-line was replaced with A?A?O?