It is impossible to involve a method of COM object in the next script:

$objMail = new COM("CDONTS.NewMail");
$objMail->From    = "tushev@adviser.ru";
$objMail->To      = "tushev@adviser.ru";
$objMail->Subject = "Mail throughout COM";
$objMail->Body    = "Body of the message";
$objMail->Send();

The string "$objMail->Send();" prints next text: 
Invoke() failed: Exception occurred

But identical script writen on ASP works fine on the same server.