[imp] send mail problem with Unicode (UTF-8) charset

[Teo.Fan]

Hi all,
I use Horde 3 and IMP 4.0. I've sent myself a message with content "Tôi
không tin đời tôi" by Unicode (UTF-8) charset. I received and viewed
message, it's look very good but when I reply it show many strange words
like

Quoting fantiteo at netcenter-vn.net:

> T=C3=B4i kh=C3=B4ng tin =C4=91=E1=BB=9Di t=C3=B4i
>
>
>

 in Text Message.
Thanks for any help.
regards,

Fan Ti Teo