ninjaMail_public/ninjamail.class.php

<?php

class ninjaMail
{

        private $host;
        private $key;
        public  $data;

        public function __construct($host, $key = false)
        {
                $this->host = $host;
                if ($key) $this->key = $key;
        }

        public function check()
        {
                if (!$this->host || !$this->key)
                  return false;
                return true;
        }

        public function process($f, $data, $post_method = true)
        {
                $ch = curl_init($this->host.'/a/'.$f.'/?key='.$this->key);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
                $data = curl_exec($ch);
                curl_close($ch);

                $data = @(object)json_decode($response);
                $this->data = $data;
                return $data;
        }

        public function login()
        {
            return $this->process('login', ['rkey' => md5(time().rand(0,65500).rand(0,10))]);
        }

}

// Send Email
class ninjaMailSend extends ninjaMail
{

    private $to;
    private $subject;
    private $message;
    private $message_text;

    public function to($to)
    {
        $this->to = $to;
        return true;
    }

    public function subject($s)
    {
        $this->subject = $s;
        return true;
    }

    public function message($m, $t = false)
    {
        $this->message = $m;
        if (!$t) $this->message_text = trim(strip_tags($m));
        else     $this->message_text = $t;
        return true;
    }

    public function send()
    {
        $post = [
            'to' => $this->to,
            'subject' => $this->subject,
            'message' => $this->message,
            'message_text' => $this->message_text
        ];
        return $this->process('send', $post, true)->status == 'message_queued' ? true : false;
    }
}

// Subscribe
class ninjaMailSubscription extends ninjaMail
{

    private $list;
    private $activated = false;

    public function list($id)
    {
        if (is_numeric($id))
        {
            $this->list = $id;
            return true;
        }
        return false;
    }

    public function activated($s)
    {
        if ($s) $this->activated = 1;
        else    $this->activated = 0;
        return true;
    }

    public function subscribe($email, $name = '')
    {
        if (!$this->list || !is_numeric($this->activated))
            return false;

        $post = [
            'list'      => $this->list,
            'name'      => $name,
            'email'     => $email,
            'activated' => $this->activated
        ];
        return $this->process('subscribe', $post, true)->status == 'success' ? true : false;
    }

    public function unsubscribe($email)
    {
        if (!$this->list)
            return false;

        $post = [
            'list'      => $this->list,
            'email'     => $email
        ];
        return $this->process('unsubscribe', $post, true)->status == 'success' ? true : false;
    }
}