Hi Dmitry,

Thanks, thank you very much for great help.

This solved my problem.

I got one good article at :
http://support.microsoft.com/?id=839560

Thanks again,
Vinayak

My code for other's reference :

BOOL CheckHTML(CComPtrIMessage pMsg, BOOL* bHtml)
{
HRESULT hr = S_OK;
LPSTREAM lpCompressed = NULL;
LPSTREAM lpUncompressed = NULL;
BOOL bRet = TRUE;
BYTE htmlbuf[UNCOMPRESSED_RTF_BUFFER_MAX_SIZE] = {0};
try
{
hr = pMsg-OpenProperty(PR_RTF_COMPRESSED,
&IID_IStream,
STGM_READ,
0,
(LPUNKNOWN*)&lpCompressed);
if( hr!= S_OK )
{
LOG_ERR_MESSAGE(_T("OpenProperty(): error while opening property
PR_RTF_COMPRESSED. ") , hr);
bRet = FALSE;
goto Error;
}

hr = WrapCompressedRTFStream(lpCompressed,
0,
&lpUncompressed
);

if( hr!= S_OK )
{
LOG_ERR_MESSAGE(_T("WrapCompressedRTFStream(): error while reading
uncompressed property PR_RTF_COMPRESSED. ") , hr);
bRet = FALSE;
goto Error;
}
ULONG red;
hr = lpUncompressed-Read(htmlbuf, UNCOMPRESSED_RTF_BUFFER_MAX_SIZE -
1, &red);
if( lpUncompressed )
lpUncompressed-Release();
if( lpCompressed )
lpCompressed-Release();
htmlbuf[UNCOMPRESSED_RTF_BUFFER_MAX_SIZE]=0;
if( htmlbuf != 0)
{
// We look for the words "\fromhtml1" somewhere in the uncompressed
RTF body
// If it contains "\fromhtml1" then we assume message format as
HTML
if( strstr( (const char*) htmlbuf, "\\fromhtml1" ) != NULL)
{
*bHtml = TRUE;
}
else
{
*bHtml = FALSE;
}
}
goto End;
}
catch(...)
{
LOG_ERR_MESSAGE(_T("Exception Generated") , GetLastError());
REPORT_SYSTEM_ERROR_TO_IRONPORT_HTTP(_T("Exception Generated"));
bRet = FALSE;
goto Error;
}
End:
Error:
return bRet;
}