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PHP:
скопировать код в буфер обмена
class mime_mail {
    var $parts;
    var $to;
    var $from;
    var $headers;
    var $subject;
    var $body;
 
    function mime_mail() {
        $this->parts = array();
        $this->to = "";
        $this->from = "";
        $this->subject = "";
        $this->body = "";
        $this->headers = "";
    }
 
    function add_attachment($message, $name = "", $ctype = "application/octet-stream") {
        $this->parts [] = array ("ctype" => $ctype, "message" => $message, "encode" => $encode, "name" => $name);
    }
 
    function build_message($part) {
        $message = $part["message"];
        $message = chunk_split(base64_encode($message));
        $encoding = "base64";
        return "Content-Type: ".$part["ctype"].($part["name"]? "; name = \"".$part["name"]."\"" : "")."\nContent-Transfer-Encoding: $encoding\n\n$message\n";
    }
 
    function build_multipart() {
        $boundary = "b".md5(uniqid(time()));
        $multipart = "Content-Type: multipart/mixed; boundary = $boundary\n\nThis is a MIME encoded message.\n\n--$boundary";
        for($i = sizeof($this->parts)-1; $i>=0; $i--) $multipart .= "\n".$this->build_message($this->parts[$i]). "--$boundary";
        return $multipart.= "--\n";
    }
 
    function send() {
        $mime = "";
        if (!empty($this->from)) $mime .= "From: ".$this->from. "\n";
        if (!empty($this->headers)) $mime .= $this->headers. "\n";
        if (!empty($this->body)) $this->add_attachment($this->body, "", "text/plain"); 
        $mime .= "MIME-Version: 1.0\n".$this->build_multipart();
        if (mail($this->to, $this->subject, "koi8-r", $mime)){
            echo "Сообщение отправлено";
        } else {
            echo "Произошла ошибка";
        }
    }
}
 
 
$mail = new mime_mail();
$mail->from = $_POST['from'];
$mail->headers = "Errors-To: [EMAIL=admin@test.ru]admin@test.ru[/EMAIL]";
$mail->to = $_POST['recipient'];
$mail->subject = $_POST['theme'];
$mail->body = $_POST['text'];
 
$path = $_SERVER['DOCUMENT_ROOT'].'/upload/tmp_msg/';
foreach ($files as $key=>$val){
    $attachment = file_get_contents($path.$val);
    $mail->add_attachment("$attachment", $val, "Content-Transfer-Encoding: base64 /9j/4AAQSkZJRgABAgEASABIAAD/7QT+UGhvdG9zaG");
}
$mail->send();