[imp] foward text has problems with UTF-8

[Teo.Fan]

Hi all,
I use IMP 4.0 and Horde 3.0
I've sent myself with a text message: "Tôi và bạn". After, I received and
view message, it's ok. But when I forwarded, in the forward text showed
strange characters.

this is my Forward text:

----- Forwarded message from thuocpv at netcenter-vn.net -----
    Date: Mon, 17 Jan 2005 08:46:59 +0700
    From: fantiteo at netcenter-vn.net
Reply-To: fantiteo at netcenter-vn.net
 Subject: test
      To: fantiteo at netsoft.com.vn

T=C3=B4i v=C3=A0 b=E1=BA=A1n
----- End forwarded message -----

Everybody have same my problem? Any help is appreciated.

Thanks and Regards