<?
$filename = "test.jpg";

$handle = fopen($filename, "rb");
$fileContent = fread($handle, filesize($filename));
fclose($handle);

$fileContent = chunk_split(base64_encode($fileContent));

$mime_boundary = "<<<--==+X[".md5(time())."]";

$headers .= "From: Automatic <email@server>\r\n"; 
$headers .= "To: SomeName <email@server>\r\n"; 
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed;\r\n";
$headers .= " boundary=\"".$mime_boundary."\"";

$message .= "This is a multi-part message in MIME format.\r\n";
$message .= "\r\n";
$message .= "--".$mime_boundary."\r\n";
$message .= "Content-Type: text/plain; charset=\"iso-8859-1\"\r\n";
$message .= "Content-Transfer-Encoding: 7bit\r\n";
$message .= "\r\n";
$message .= "Email content and what not: \r\n";
$message .= "This is the file you asked for! \r\n";
$message .= "--".$mime_boundary."\r\n";
$message .= "Content-Type: image/jpg;\r\n";
$message .= " name=\"test.jpg\"\r\n";
$message .= "Content-Transfer-Encoding: base64\r\n";
$message .= "Content-Disposition: attachment;\r\n";
$message .= " filename=\"test.jpg\"\r\n";
$message .= "\r\n";

$message .= $fileContent;
$message .= "\r\n";
$message .= "--".$mime_boundary."\r\n";

$ok = mail("email@server", "file by email", $message, $headers);
?>