*1
require_once "Mail/mimeDecode.php";
$params = array();
$params["include_bodies"] = FALSE;
$params["decode_bodies"] = FALSE;
$params["decode_headers"] = TRUE;
$params["input"] = $input;
$params["crlf"] = "\n";
$structure = Mail_mimeDecode::decode($additional_headers);
*2
require_once "Mail/RFC822.php";
$from_structure = Mail_RFC822::parseAddressList( $structure->headers[ "from"]);