diff --git a/README.md b/README.md
index 3b6b791..8ce2fe6 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,8 @@
-# turbosmtp-api-client
-PHP library to send mail using Turbo SMTP API v2
+# turboSMTP API v2 client for PHP 5.2
+
+PHP 5.2 library to send mail using Turbo SMTP API v2
+
+## License
+
+Autor: [emiliort](https://github.com/emiliort).
+Licensed under the terms of the [MIT license](LICENSE).
diff --git a/TurboSmtpClient.php b/TurboSmtpClient.php
new file mode 100644
index 0000000..31295c1
--- /dev/null
+++ b/TurboSmtpClient.php
@@ -0,0 +1,118 @@
+<?php
+/**
+ * turboSMTP API v2 Client for PHP 5.2
+ */
+class TurboSmtpClient {
+    private $authuser;
+    private $authpass;
+    private $server;
+    private $endPoint; 
+
+    /**
+     * Undocumented function
+     *
+     * @param string $authuser authuser is the email of turboSMTP account (this param can be used as POST or Headers)
+     * @param string $authpass authpass is the password of turboSMTP account (this param can be used as POST or Headers)
+     * @param boolean $europe ¿use european servers? Default false
+     */
+    public function __construct($authuser,$authpass,$europe=false){
+        $this->authuser=$authuser;
+        $this->authpass=$authpass;
+        if ($europe) {
+            $this->server='api.eu.turbo-smtp.com';
+        } else {
+            $this->server='api.turbo-smtp.com';
+        }
+        $this->endPoint='https://'.$this->server.'/api/v2/mail/send';
+    }
+
+    /**
+     * Send email
+     * 
+     * @param string $from is the from address
+     * @param string $to is provided as comma-separated recipients list
+     * @param string $subject is the subject of the email (optional)
+     * @param string $content is the text content of the email  (optional)
+     * @param string $html_content is the html content of the email (optional)
+     * @param string $cc is provided as comma-separated copy list (optional)
+     * @param string $bcc is provided as comma-separated hidden copy list (optional)
+     * @param string $replyTo reply to adress (optional)
+     * @param array $custom_headers are additional headers, e.g. ["X-key1"=>"value1", "X-key2"=>"value2"] (optional)
+     * @param string $mime_raw mime message which replaces content and html_content  (optional)
+     * @param array attachments array of attachment objects
+     * @return array response {"message":"OK"} or {"message": "error","errors": ["error message"] } 
+     */
+    public function send($from,$to,$subject=null,$content=null,$html_content=null,$cc=null,$bcc=null,$replyTo=null,$custom_headers=null,$mime_raw=null,$attachments=null) {   
+        
+        $curl = curl_init();
+        curl_setopt($curl, CURLOPT_URL, $this->endPoint );        		
+        
+        //debug
+        //curl_setopt($curl, CURLOPT_VERBOSE, true);     
+        
+		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
+
+        $post=array(
+            'authuser' => $this->authuser,
+            'authpass' => $this->authpass,
+            'from'=>$from,
+            'to'=>$to,
+            'subject'=>$subject,
+            'cc'=>$cc,
+            'bcc'=>$bcc,
+            'content'=>$content,
+            'html_content'=>$html_content,
+            'custom_headers'=>$this->getHeaders($replyTo, $custom_headers),
+            'mime_raw'=>$mime_raw,
+            'attachments'=>$attachments,
+         );
+        curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
+
+        $response = curl_exec($curl); 
+        curl_close($curl); 
+        $response=json_decode($response,true);
+        return $response;
+    }
+
+    /**
+     * Generate a ID for custom headers
+     *
+     * @return string
+     */
+
+    private function generateMessageId()
+    {        
+        $len = 32; //32 bytes = 256 bits
+        if (function_exists('random_bytes')) {
+            $bytes = random_bytes($len);
+        } elseif (function_exists('openssl_random_pseudo_bytes')) {
+            $bytes = openssl_random_pseudo_bytes($len);
+        } else {
+            //Use a hash to force the length to the same as the other methods
+            $bytes = hash('sha256', uniqid((string) mt_rand(), true), true);
+        }
+        //We don't care about messing up base64 format here, just want a random string
+        $id=str_replace(array('=', '+', '/'), '', base64_encode(hash('sha256', $bytes, true)));
+        return sprintf('<%s@%s>', $id,$this->server);
+    }
+
+    private function getHeaders ($replyTo, $custom_headers) {
+        $headers= array (
+            'Date'=>date("r"),
+            'Message-Id'=>$this->generateMessageId(),
+        );
+
+        if (!empty($replyTo))
+        {
+        $headers['Reply-To']=trim($replyTo);
+        }
+
+        if (is_array($custom_headers))
+        {
+        $headers=array_merge($headers,$custom_headers);
+        }
+        return json_encode($headers);
+
+    }
+
+}
\ No newline at end of file