<?php
  $defaults = array(
    'MIME-Version' => '1.0',
    'Content-Type' => 'text/plain; charset=UTF-8; format=flowed',
    'Content-Transfer-Encoding' => '8Bit',
    'X-Mailer' => 'Drupal'
  );

	$header = "From: \ndrupal@openquest.pt\nFrom: infiltrado@dummy.com\nGlu:\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from";
	// remove all '\r' and explode the header
	$header = str_replace('\r', '', $header);
	$headers = explode("\n", $header);
	foreach($headers as $key) {
		$dummy = explode(":", $key);
		if (strtolower($dummy[0]) == 'reply-to') $dummy[0] = 'Reply-To';
		if (strtolower($dummy[0]) == 'return-path') $dummy[0] = 'Return-Path';
		if (strtolower($dummy[0]) == 'errors-to') $dummy[0] = 'Errors-To';
		if ($dummy[0] != '' && !isset($defaults[$dummy[0]])) {
			$defaults[$dummy[0]] = $dummy[1];
		}
	}

  if (isset($defaults['From'])) {
    $defaults['Reply-To'] = $defaults['Return-Path'] = $defaults['Errors-To'] = $defaults['From'];
  }

	print_r($defaults);
?>