If you need lower-case header-names (as I read the documentation case is not guranteed) try something like<?php$headers_string = <<<EOFSubject: =?UTF-8?B?UHLDvGZ1bmcgUHLDvGZ1bmc=?=To: example@example.comDate: Thu, 1 Jan 1970 00:00:00 +0000Message-Id: <example@example.com>Received: from localhost (localhost [127.0.0.1]) by localhost with SMTP id example for <example@example.com>; Thu, 1 Jan 1970 00:00:00 +0000 (UTC) (envelope-from example-return-0000-example=example.com@example.com)Received: (qmail 0 invoked by uid 65534); 1 Thu 2003 00:00:00 +0000EOF;$headers = iconv_mime_decode_headers($headers_string, 0, "ISO-8859-1");$headers = array_combine(array_map("strtolower", array_keys($headers)), array_values($headers));print_r($headers);?>