hello.
yeah1
yeah2
YAHOO!

hello.=20
yeah1yeah2YAHOO!=20

foreach (new RecursiveIteratorIterator($message) as $numPart => $part) {
    $content = Zend_Mime_Decode::decodeQuotedPrintable($part->getContent());
    echo "<textarea style='height: 400px;'>".($content)."</textarea>";
}