[imp] inline html is not working

Mon Feb 11 02:53:58 UTC 2008

I have following server configuration
PHP Version 4.4.4-8+etch4
Apache 2.2.3-4+etch1
Horde 3.1.3
Imp H3 (4.1.3)
Passwd H3 (3.0)
Ingo H3 (1.1.2)
Turba H3 (2.1.3)
Mimp H3 (1.0.2)

I set $mime_drivers['imp']['html']['inline'] = true; in file
imp/config/mime_drivers.php to see text/html part inline.

But I am not able to see it inline. It shows html tags like(<html>,<body>, <br>
etc) intact. It is not evaluating any html tags in any message.

What could be the problem? What do I need to check to solve this problem?
I verify message content from horde by clicking on show all headers link and it
shows following:
Content-Type:   text/html; charset=iso-8859-1;

Thanks