diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..7769b44
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,8 @@
+* text=auto
+
+/tests export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.travis.yml export-ignore
+/phpunit.xml.dist export-ignore
+/README.md export-ignore
diff --git a/.gitignore b/.gitignore
index c70cc03..96e828d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ vendor/
 composer.lock
 .idea/
 docs/
+phpunit.xml
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..b174b06
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,11 @@
+language: php
+sudo: false
+php:
+  - "7.4"
+  - "7.3"
+  - "7.2"
+  - "7.1"
+  - "7.0"
+  - "5.6"
+install: composer update
+script: ./vendor/bin/phpunit --verbose
diff --git a/README.md b/README.md
index 682535f..3de0a29 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@ A lightweight SMTP mail sender
 
 ```
 $ composer require txthinking/mailer
+# or
+$ composer require txthinking/mailer:dev-master
 ```
 
 ### Usage
@@ -16,36 +18,16 @@ $ composer require txthinking/mailer
 use Tx\Mailer;
 
 $ok = (new Mailer())
-    ->setServer('smtp.ym.163.com', 25)
-    ->setAuth('', '') // email, password
-    ->setFrom('You', '') //your name, your email
-    ->setFakeFrom('heelo', 'bot@fake.com') // if u want, a fake name, a fake email
-    ->addTo('Cloud', 'cloud@txthinking.com')
-    ->setSubject('Test Mailer')
-    ->setBody('Hi, I <strong>love</strong> you.')
+    ->setServer('smtp.server.com', 25)
+    ->setAuth('tom@server.com', 'password')
+    ->setFrom('Tom', 'tom@server.com')
+    ->setFakeFrom('Obama', 'fake@address.com') // if u want, a fake name, a fake email
+    ->addTo('Jerry', 'jerry@server.com')
+    ->setSubject('Hello')
+    ->setBody('Hi, Jerry! I <strong>love</strong> you.')
     ->addAttachment('host', '/etc/hosts')
     ->send();
 var_dump($ok);
 ```
-OR
-```
-<?php
-use \Tx\Mailer\SMTP;
-use \Tx\Mailer\Message;
-use \Monolog\Logger;
-
-$smtp = new SMTP(); // new SMTP(new Logger('Mailer')); # set logger to receive debug log
-$smtp->setServer('smtp.ym.163.com', 25)
-    ->setAuth('bot@ym.txthinking.com', ''); // email, password
+More [Example](https://github.com/txthinking/Mailer/tree/master/tests)
 
-$message = new Message();
-$message->setFrom('Tom', 'your@mail.com') // your name, your email
-    ->setFakeFrom('heelo', 'bot@fake.com') // if u want, a fake name, a fake email
-    ->addTo('Cloud', 'cloud@txthinking.com')
-    ->setSubject('Test Mailer')
-    ->setBody('<h1>For test</h1>')
-    ->addAttachment('host', '/etc/hosts');
-
-$ok = $smtp->send($message);
-var_dump($ok);
-```
diff --git a/composer.json b/composer.json
index b07579a..e3620d2 100644
--- a/composer.json
+++ b/composer.json
@@ -19,11 +19,11 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "monolog/monolog": "~1.13"
+        "psr/log": "~1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
-        "erb/testing-tools": "dev-master"
+        "phpunit/phpunit": "~5.0",
+        "monolog/monolog": "~1.13"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index b6d1c21..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,1123 +0,0 @@
-{
-    "_readme": [
-        "This file locks the dependencies of your project to a known state",
-        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
-        "This file is @generated automatically"
-    ],
-    "hash": "6f23b14407b2e8daca111b6b0379a606",
-    "packages": [
-        {
-            "name": "monolog/monolog",
-            "version": "1.13.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "c31a2c4e8db5da8b46c74cf275d7f109c0f249ac"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/c31a2c4e8db5da8b46c74cf275d7f109c0f249ac",
-                "reference": "c31a2c4e8db5da8b46c74cf275d7f109c0f249ac",
-                "shasum": ""
-            },
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-            },
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-            },
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-                "raven/raven": "~0.5",
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-                "videlalvaro/php-amqplib": "~2.4"
-            },
-            "suggest": {
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-                "doctrine/couchdb": "Allow sending log messages to a CouchDB server",
-                "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
-                "ext-mongo": "Allow sending log messages to a MongoDB server",
-                "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
-                "raven/raven": "Allow sending log messages to a Sentry server",
-                "rollbar/rollbar": "Allow sending log messages to Rollbar",
-                "ruflin/elastica": "Allow sending log messages to an Elastic Search server",
-                "videlalvaro/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib"
-            },
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-            "extra": {
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-                }
-            },
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-                "psr-4": {
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-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "Jordi Boggiano",
-                    "email": "j.boggiano@seld.be",
-                    "homepage": "http://seld.be"
-                }
-            ],
-            "description": "Sends your logs to files, sockets, inboxes, databases and various web services",
-            "homepage": "http://github.com/Seldaek/monolog",
-            "keywords": [
-                "log",
-                "logging",
-                "psr-3"
-            ],
-            "time": "2015-03-09 09:58:04"
-        },
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-            "version": "1.0.0",
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-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
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-            "homepage": "http://www.github.com/sebastianbergmann/environment",
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-            "license": [
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-                    "homepage": "http://symfony.com/contributors"
-                },
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-                }
-            ],
-            "description": "Symfony Yaml Component",
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-            "time": "2015-03-12 10:28:44"
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-    "minimum-stability": "stable",
-    "stability-flags": {
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-    },
-    "prefer-stable": false,
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-    },
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diff --git a/phpunit.xml b/phpunit.xml.dist
similarity index 100%
rename from phpunit.xml
rename to phpunit.xml.dist
diff --git a/src/Mailer.php b/src/Mailer.php
index 9226041..eab1b6d 100644
--- a/src/Mailer.php
+++ b/src/Mailer.php
@@ -1,4 +1,4 @@
-<?php namespace Tx;
+<?php
 /***************************************************\
  *
  *  Mailer (https://github.com/txthinking/Mailer)
@@ -16,6 +16,7 @@
  *  Under the MIT license.
  *
  \***************************************************/
+namespace Tx;
 
 use Psr\Log\LoggerInterface;
 use \Tx\Mailer\Message;
@@ -29,7 +30,8 @@
  *
  * @package Tx
  */
-class Mailer{
+class Mailer
+{
     /**
      * SMTP Class
      * @var SMTP
@@ -44,8 +46,10 @@ class Mailer{
 
     /**
      * construct function
+     * @param LoggerInterface $logger
      */
-    public function __construct(LoggerInterface $logger=null){
+    public function __construct(LoggerInterface $logger=null)
+    {
         $this->smtp = new SMTP($logger);
         $this->message = new Message();
     }
@@ -54,10 +58,11 @@ public function __construct(LoggerInterface $logger=null){
      * set server and port
      * @param string $host server
      * @param int $port port
-     * @param string $secure ssl tls
+     * @param string $secure ssl tls tlsv1.0 tlsv1.1 tlsv1.2
      * @return $this
      */
-    public function setServer($host, $port, $secure=null){
+    public function setServer($host, $port, $secure=null)
+    {
         $this->smtp->setServer($host, $port, $secure);
         return $this;
     }
@@ -68,18 +73,31 @@ public function setServer($host, $port, $secure=null){
      * @param string $password
      * @return $this
      */
-    public function setAuth($username, $password){
+    public function setAuth($username, $password)
+    {
         $this->smtp->setAuth($username, $password);
         return $this;
     }
 
+    /**
+     * auth oauthbearer with server
+     * @param string $accessToken
+     * @return $this
+     */
+    public function setOAuth($accessToken)
+    {
+        $this->smtp->setOAuth($accessToken);
+        return $this;
+    }
+
     /**
      * set mail from
      * @param string $name
      * @param string $email
      * @return $this
      */
-    public function setFrom($name, $email){
+    public function setFrom($name, $email)
+    {
         $this->message->setFrom($name, $email);
         return $this;
     }
@@ -90,30 +108,45 @@ public function setFrom($name, $email){
      * @param string $email
      * @return $this
      */
-    public function setFakeFrom($name, $email){
+    public function setFakeFrom($name, $email)
+    {
         $this->message->setFakeFrom($name, $email);
         return $this;
     }
 
     /**
-     * set mail receiver
+     * add mail receiver
      * @param string $name
      * @param string $email
      * @return $this
      */
-    public function setTo($name, $email){
+    public function addTo($name, $email)
+    {
         $this->message->addTo($name, $email);
         return $this;
     }
 
     /**
-     * add mail receiver
+     * add cc mail receiver
      * @param string $name
      * @param string $email
      * @return $this
      */
-    public function addTo($name, $email){
-        $this->message->addTo($name, $email);
+    public function addCc($name, $email)
+    {
+        $this->message->addCc($name, $email);
+        return $this;
+    }
+
+    /**
+     * add bcc mail receiver
+     * @param string $name
+     * @param string $email
+     * @return $this
+     */
+    public function addBcc($name, $email)
+    {
+        $this->message->addBcc($name, $email);
         return $this;
     }
 
@@ -122,7 +155,8 @@ public function addTo($name, $email){
      * @param string $subject
      * @return $this
      */
-    public function setSubject($subject){
+    public function setSubject($subject)
+    {
         $this->message->setSubject($subject);
         return $this;
     }
@@ -132,32 +166,33 @@ public function setSubject($subject){
      * @param string $body
      * @return $this
      */
-    public function setBody($body){
+    public function setBody($body)
+    {
         $this->message->setBody($body);
         return $this;
     }
 
     /**
-     * set mail attachment
+     * add mail attachment
      * @param $name
      * @param $path
      * @return $this
-     * @internal param string $attachment
      */
-    public function setAttachment($name, $path){
+    public function addAttachment($name, $path)
+    {
         $this->message->addAttachment($name, $path);
         return $this;
     }
 
     /**
-     * add mail attachment
-     * @param $name
-     * @param $path
+     * set mail reply-to
+     * @param string $name
+     * @param string $email
      * @return $this
-     * @internal param string $attachment
      */
-    public function addAttachment($name, $path){
-        $this->message->addAttachment($name, $path);
+    public function setReplyTo($name, $email)
+    {
+        $this->message->setReplyTo($name, $email);
         return $this;
     }
 
@@ -165,7 +200,8 @@ public function addAttachment($name, $path){
      *  Send the message...
      * @return boolean
      */
-    public function send(){
+    public function send()
+    {
         return $this->smtp->send($this->message);
     }
 
diff --git a/src/Mailer/Message.php b/src/Mailer/Message.php
index 379c458..7215f88 100644
--- a/src/Mailer/Message.php
+++ b/src/Mailer/Message.php
@@ -1,4 +1,4 @@
-<?php namespace Tx\Mailer;
+<?php
 /***************************************************\
  *
  *  Mailer (https://github.com/txthinking/Mailer)
@@ -16,6 +16,8 @@
  *  Under the MIT license.
  *
  \***************************************************/
+namespace Tx\Mailer;
+
 class Message
 {
     /**
@@ -43,6 +45,16 @@ class Message
      */
     protected $to = array();
 
+    /**
+     * cc email
+     */
+    protected $cc = array();
+
+    /**
+     * bcc email
+     */
+    protected $bcc = array();
+
     /**
      * mail subject
      */
@@ -84,6 +96,28 @@ class Message
      */
     protected $CRLF = "\r\n";
 
+
+    /**
+     * Address for the reply-to header
+     * @var string
+     */
+    protected $replyToName;
+
+    /**
+     * Address for the reply-to header
+     * @var string
+     */
+    protected $replyToEmail;
+
+
+    public function setReplyTo($name, $email)
+    {
+        $this->replyToName = $name;
+        $this->replyToEmail = $email;
+        return $this;
+    }
+
+
     /**
      * set mail from
      * @param string $name
@@ -112,55 +146,60 @@ public function setFakeFrom($name, $email)
     }
 
     /**
-     * set mail receiver
+     * add mail receiver
      * @param string $name
      * @param string $email
      * @return $this
      */
-    public function setTo($name, $email){
-        $this->to[$name] = $email;
+    public function addTo($name, $email)
+    {
+        $this->to[$email] = $name;
         return $this;
     }
 
     /**
-     * add mail receiver
+     * add cc mail receiver
      * @param string $name
      * @param string $email
      * @return $this
      */
-    public function addTo($name, $email){
-        $this->to[$name] = $email;
+    public function addCc($name, $email)
+    {
+        $this->cc[$email] = $name;
         return $this;
     }
 
     /**
-     * set mail subject
-     * @param string $subject
+     * add bcc mail receiver
+     * @param string $name
+     * @param string $email
      * @return $this
      */
-    public function setSubject($subject){
-        $this->subject = $subject;
+    public function addBcc($name, $email)
+    {
+        $this->bcc[$email] = $name;
         return $this;
     }
 
     /**
-     * set mail body
-     * @param string $body
+     * set mail subject
+     * @param string $subject
      * @return $this
      */
-    public function setBody($body){
-        $this->body = $body;
+    public function setSubject($subject)
+    {
+        $this->subject = $subject;
         return $this;
     }
 
     /**
-     * add mail attachment
-     * @param $name
-     * @param $path
+     * set mail body
+     * @param string $body
      * @return $this
      */
-    public function setAttachment($name, $path){
-        $this->attachment[$name] = $path;
+    public function setBody($body)
+    {
+        $this->body = $body;
         return $this;
     }
 
@@ -170,7 +209,8 @@ public function setAttachment($name, $path){
      * @param $path
      * @return $this
      */
-    public function addAttachment($name, $path){
+    public function addAttachment($name, $path)
+    {
         $this->attachment[$name] = $path;
         return $this;
     }
@@ -216,6 +256,22 @@ public function getTo()
         return $this->to;
     }
 
+    /**
+     * @return mixed
+     */
+    public function getCc()
+    {
+        return $this->cc;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getBcc()
+    {
+        return $this->bcc;
+    }
+
     /**
      * @return mixed
      */
@@ -244,24 +300,65 @@ public function getAttachment()
      * Create mail header
      * @return $this
      */
-    protected function createHeader(){
+    protected function createHeader()
+    {
         $this->header['Date'] = date('r');
 
+        $fromName = "";
+        $fromEmail = $this->fromEmail;
+        if(!empty($this->fromName)){
+            $fromName = sprintf("=?utf-8?B?%s?= ", base64_encode($this->fromName));
+        }
         if(!empty($this->fakeFromEmail)){
-            $this->header['Return-Path'] = $this->fakeFromEmail;
-            $this->header['From'] = $this->fakeFromName . " <" . $this->fakeFromEmail . ">";
-        } else{
-            $this->header['Return-Path'] = $this->fromEmail;
-            $this->header['From'] = $this->fromName . " <" . $this->fromEmail .">";
+            if(!empty($this->fakeFromName)){
+                $fromName = sprintf("=?utf-8?B?%s?= ", base64_encode($this->fakeFromName));
+            }
+            $fromEmail = $this->fakeFromEmail;
         }
+        $this->header['Return-Path'] = $fromEmail;
+        $this->header['From'] = $fromName . "<" . $fromEmail .">";
 
         $this->header['To'] = '';
-        foreach ($this->to as $toName => $toEmail) {
-            $this->header['To'] .= $toName . " <" . $toEmail . ">, ";
+        foreach ($this->to as $toEmail => $toName) {
+            if(!empty($toName)){
+                $toName = sprintf("=?utf-8?B?%s?= ", base64_encode($toName));
+            }
+            $this->header['To'] .= $toName . "<" . $toEmail . ">, ";
         }
         $this->header['To'] = substr($this->header['To'], 0, -2);
-        $this->header['Subject'] = $this->subject;
-        $this->header['Message-ID'] = '<' . md5('TX'.md5(time()).uniqid()) . '@' . $this->fromEmail . '>';
+        $this->header['Cc'] = '';
+        foreach ($this->cc as $toEmail => $toName) {
+            if(!empty($toName)){
+                $toName = sprintf("=?utf-8?B?%s?= ", base64_encode($toName));
+            }
+            $this->header['Cc'] .= $toName . "<" . $toEmail . ">, ";
+        }
+        $this->header['Cc'] = substr($this->header['Cc'], 0, -2);
+        $this->header['Bcc'] = '';
+        foreach ($this->bcc as $toEmail => $toName) {
+            if(!empty($toName)){
+                $toName = sprintf("=?utf-8?B?%s?= ", base64_encode($toName));
+            }
+            $this->header['Bcc'] .= $toName . "<" . $toEmail . ">, ";
+        }
+        $this->header['Bcc'] = substr($this->header['Bcc'], 0, -2);
+
+        $replyToName = "";
+        if(!empty($this->replyToEmail)){
+            if(!empty($this->replyToName)){
+                $replyToName = sprintf("=?utf-8?B?%s?= ", base64_encode($this->replyToName));
+            }
+            $this->header['Reply-To'] = $replyToName . "<" . $this->replyToEmail . ">";
+        }
+
+        if(empty($this->subject)){
+            $subject = '';
+        }else{
+            $subject = sprintf("=?utf-8?B?%s?= ", base64_encode($this->subject));
+        }
+        $this->header['Subject'] = $subject;
+
+        $this->header['Message-ID'] = '<' . md5(uniqid()) . '@' . $this->fromEmail . '>';
         $this->header['X-Priority'] = '3';
         $this->header['X-Mailer'] = 'Mailer (https://github.com/txthinking/Mailer)';
         $this->header['MIME-Version'] = '1.0';
@@ -278,7 +375,8 @@ protected function createHeader(){
      *
      * @return string
      */
-    protected function createBody(){
+    protected function createBody()
+    {
         $in = "";
         $in .= "Content-Type: multipart/alternative; boundary=\"$this->boundaryAlternative\"" . $this->CRLF;
         $in .= $this->CRLF;
@@ -303,7 +401,8 @@ protected function createBody(){
      *
      * @return string
      */
-    protected function createBodyWithAttachment(){
+    protected function createBodyWithAttachment()
+    {
         $in = "";
         $in .= $this->CRLF;
         $in .= $this->CRLF;
@@ -338,7 +437,8 @@ protected function createBodyWithAttachment(){
         return $in;
     }
 
-    public function toString(){
+    public function toString()
+    {
         $in = '';
         $this->createHeader();
         foreach ($this->header as $key => $value) {
diff --git a/src/Mailer/SMTP.php b/src/Mailer/SMTP.php
index 0be065c..9ed80ef 100644
--- a/src/Mailer/SMTP.php
+++ b/src/Mailer/SMTP.php
@@ -42,10 +42,20 @@ class SMTP
     protected $port;
 
     /**
-     * smtp secure ssl tls
+     * smtp secure ssl tls tlsv1.0 tlsv1.1 tlsv1.2
      */
     protected $secure;
 
+    /**
+     * smtp allow insecure ssl
+     */
+    protected $allowInsecure;
+
+    /**
+     * EHLO message
+     */
+    protected $ehlo;
+
     /**
      * smtp username
      */
@@ -56,6 +66,11 @@ class SMTP
      */
     protected $password;
 
+    /**
+     * oauth access token
+     */
+    protected $oauthToken;
+
     /**
      * $this->CRLF
      * @var string
@@ -93,28 +108,54 @@ public function __construct(LoggerInterface $logger=null)
      * set server and port
      * @param string $host server
      * @param int $port port
-     * @param string $secure ssl tls
+     * @param string $secure ssl tls tlsv1.0 tlsv1.1 tlsv1.2
      * @return $this
      */
-    public function setServer($host, $port, $secure=null)
+    public function setServer($host, $port, $secure=null, $allowInsecure=null)
     {
         $this->host = $host;
         $this->port = $port;
         $this->secure = $secure;
+        $this->allowInsecure = $allowInsecure;
+        if(!$this->ehlo) $this->ehlo = $host;
         $this->logger && $this->logger->debug("Set: the server");
         return $this;
     }
 
     /**
-     * auth with server
+     * auth login with server
      * @param string $username
      * @param string $password
      * @return $this
      */
-    public function setAuth($username, $password){
+    public function setAuth($username, $password)
+    {
         $this->username = $username;
         $this->password = $password;
-        $this->logger && $this->logger->debug("Set: the auth");
+        $this->logger && $this->logger->debug("Set: the auth login");
+        return $this;
+    }
+
+    /**
+     * auth oauthbearer with server
+     * @param string $accessToken
+     * @return $this
+     */
+    public function setOAuth($accessToken)
+    {
+        $this->oauthToken = $accessToken;
+        $this->logger && $this->logger->debug("Set: the auth oauthbearer");
+        return $this;
+    }
+
+    /**
+     * set the EHLO message
+     * @param $ehlo
+     * @return $this
+     */
+    public function setEhlo($ehlo)
+    {
+        $this->ehlo = $ehlo;
         return $this;
     }
 
@@ -122,23 +163,29 @@ public function setAuth($username, $password){
      * Send the message
      *
      * @param Message $message
-     * @return $this
+     * @return bool
      * @throws CodeException
      * @throws CryptoException
      * @throws SMTPException
      */
-    public function send(Message $message){
+    public function send(Message $message)
+    {
         $this->logger && $this->logger->debug('Set: a message will be sent');
         $this->message = $message;
         $this->connect()
             ->ehlo();
 
-        if ($this->secure === 'tls'){
+        if ($this->secure === 'tls' || $this->secure === 'tlsv1.0' || $this->secure === 'tlsv1.1' | $this->secure === 'tlsv1.2') {
             $this->starttls()
                 ->ehlo();
         }
-        $this->authLogin()
-            ->mailFrom()
+
+        if ($this->username !== null || $this->password !== null) {
+            $this->authLogin();
+        } elseif ($this->oauthToken !== null) {
+            $this->authOAuthBearer();
+        }
+        $this->mailFrom()
             ->rcptTo()
             ->data()
             ->quit();
@@ -152,10 +199,29 @@ public function send(Message $message){
      * @throws CodeException
      * @throws SMTPException
      */
-    protected function connect(){
+    protected function connect()
+    {
         $this->logger && $this->logger->debug("Connecting to {$this->host} at {$this->port}");
         $host = ($this->secure == 'ssl') ? 'ssl://' . $this->host : $this->host;
-        $this->smtp = @fsockopen($host, $this->port);
+        // Create connection
+        $context = null;
+        if ($this->allowInsecure) {
+            $context = stream_context_create([
+                'ssl' => [
+                    'security_level' => 0,
+                    'verify_peer' => false,
+                    'verify_peer_name' => false
+                ]
+            ]);
+        }
+        $this->smtp = stream_socket_client(
+            $host.':'.$this->port,
+            $error_code,
+            $error_message,
+            ini_get('default_socket_timeout'),
+            STREAM_CLIENT_CONNECT,
+            $context
+        );
         //set block mode
         //    stream_set_blocking($this->smtp, 1);
         if (!$this->smtp){
@@ -176,12 +242,36 @@ protected function connect(){
      * @throws CryptoException
      * @throws SMTPException
      */
-    protected function starttls(){
-        $code = $this->pushStack("STARTTLS");
+    protected function starttls()
+    {
+        $in = "STARTTLS" . $this->CRLF;
+        $code = $this->pushStack($in);
         if ($code !== '220'){
             throw new CodeException('220', $code, array_pop($this->resultStack));
         }
-        if(!stream_socket_enable_crypto($this->smtp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) {
+
+        if ($this->secure !== 'tls' && version_compare(phpversion(), '5.6.0', '<')) {
+            throw new CryptoException('Crypto type expected PHP 5.6 or greater');
+        }
+
+        switch ($this->secure) {
+            case 'tlsv1.0':
+                $crypto_type = STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT;
+                break;
+            case 'tlsv1.1':
+                $crypto_type = STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
+                break;
+            case 'tlsv1.2':
+                $crypto_type = STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
+                break;
+            default:
+                $crypto_type = STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT |
+                               STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT |
+                               STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
+                break;
+        }
+
+        if(!\stream_socket_enable_crypto($this->smtp, true, $crypto_type)) {
             throw new CryptoException("Start TLS failed to enable crypto");
         }
         return $this;
@@ -194,8 +284,9 @@ protected function starttls(){
      * @throws CodeException
      * @throws SMTPException
      */
-    protected function ehlo(){
-        $in = "EHLO " . $this->host . $this->CRLF;
+    protected function ehlo()
+    {
+        $in = "EHLO " . $this->ehlo . $this->CRLF;
         $code = $this->pushStack($in);
         if ($code !== '250'){
             throw new CodeException('250', $code, array_pop($this->resultStack));
@@ -214,12 +305,6 @@ protected function ehlo(){
      */
     protected function authLogin()
     {
-        if ($this->username === null && $this->password === null) {
-            // Unless the user has specifically set a username/password
-            // Do not try to authorize.
-            return $this;
-        }
-
         $in = "AUTH LOGIN" . $this->CRLF;
         $code = $this->pushStack($in);
         if ($code !== '334'){
@@ -238,6 +323,60 @@ protected function authLogin()
         return $this;
     }
 
+    /**
+     * SMTP AUTH OAUTHBEARER
+     * SUCCESS 235
+     * @return $this
+     * @throws CodeException
+     * @throws SMTPException
+     */
+    protected function authOAuthBearer()
+    {
+        $authStr = sprintf("n,a=%s,%shost=%s%sport=%s%sauth=Bearer %s%s%s",
+            $this->message->getFromEmail(),
+            chr(1),
+            $this->host,
+            chr(1),
+            $this->port,
+            chr(1),
+            $this->oauthToken,
+            chr(1),
+            chr(1)
+        );
+        $authStr = base64_encode($authStr);
+        $in = "AUTH OAUTHBEARER $authStr" . $this->CRLF;
+        $code = $this->pushStack($in);
+        if ($code !== '235'){
+            throw new CodeException('235', $code, array_pop($this->resultStack));
+        }
+        return $this;
+    }
+
+    /**
+     * SMTP AUTH XOAUTH2
+     * SUCCESS 235
+     * @return $this
+     * @throws CodeException
+     * @throws SMTPException
+     */
+    protected function authXOAuth2()
+    {
+        $authStr = sprintf("user=%s%sauth=Bearer %s%s%s",
+            $this->message->getFromEmail(),
+            chr(1),
+            $this->oauthToken,
+            chr(1),
+            chr(1)
+        );
+        $authStr = base64_encode($authStr);
+        $in = "AUTH XOAUTH2 $authStr" . $this->CRLF;
+        $code = $this->pushStack($in);
+        if ($code !== '235'){
+            throw new CodeException('235', $code, array_pop($this->resultStack));
+        }
+        return $this;
+    }
+
     /**
      * SMTP MAIL FROM
      * SUCCESS 250
@@ -245,7 +384,8 @@ protected function authLogin()
      * @throws CodeException
      * @throws SMTPException
      */
-    protected function mailFrom(){
+    protected function mailFrom()
+    {
         $in = "MAIL FROM:<{$this->message->getFromEmail()}>" . $this->CRLF;
         $code = $this->pushStack($in);
         if ($code !== '250') {
@@ -261,8 +401,14 @@ protected function mailFrom(){
      * @throws CodeException
      * @throws SMTPException
      */
-    protected function rcptTo(){
-        foreach ($this->message->getTo() as $toEmail) {
+    protected function rcptTo()
+    {
+        $to = array_merge(
+            $this->message->getTo(),
+            $this->message->getCc(),
+            $this->message->getBcc()
+        );
+        foreach ($to as $toEmail=>$_) {
             $in = "RCPT TO:<" . $toEmail . ">" . $this->CRLF;
             $code = $this->pushStack($in);
             if ($code !== '250') {
@@ -280,7 +426,8 @@ protected function rcptTo(){
      * @throws CodeException
      * @throws SMTPException
      */
-    protected function data(){
+    protected function data()
+    {
         $in = "DATA" . $this->CRLF;
         $code = $this->pushStack($in);
         if ($code !== '354') {
@@ -301,7 +448,8 @@ protected function data(){
      * @throws CodeException
      * @throws SMTPException
      */
-    protected function quit(){
+    protected function quit()
+    {
         $in = "QUIT" . $this->CRLF;
         $code = $this->pushStack($in);
         if ($code !== '221'){
@@ -324,7 +472,8 @@ protected function pushStack($string)
      * @return string
      * @throws SMTPException
      */
-    protected function getCode() {
+    protected function getCode()
+    {
         while ($str = fgets($this->smtp, 515)) {
             $this->logger && $this->logger->debug("Got: ". $str);
             $this->resultStack[] = $str;
diff --git a/tests/MailerTest.php b/tests/MailerTest.php
index e2bbd75..55f54e1 100644
--- a/tests/MailerTest.php
+++ b/tests/MailerTest.php
@@ -6,45 +6,29 @@
 use \Tx\Mailer\Exceptions\SMTPException;
 use \Monolog\Logger;
 
-class MailerTest extends TestCase {
+class MailerTest extends TestCase
+{
 
-    protected $smtp;
-    protected $message;
-
-    public function setup(){
-        $this->smtp = new SMTP(new Logger('SMTP'));
-        $this->message = new Message();
-    }
-
-    public function testSMTP(){
-        $this->smtp
-            ->setServer('smtp.ym.163.com', 25)
-            ->setAuth('bot@ym.txthinking.com', ''); // email, password
-
-        $this->message
-            ->setFrom('Tom', 'bot@ym.txthinking.com') // your name, your email
-            ->setFakeFrom('heelo', 'bot@hello.com') // a fake name, a fake email
-            ->addTo('Cloud', 'cloud@txthinking.com')
-            ->setSubject('Test SMTP ' . time())
-            ->setBody('<h1>for test</h1>')
-            ->addAttachment('host', '/etc/hosts');
-
-        $status = $this->smtp->send($this->message);
-        $this->assertTrue($status);
+    public function setup()
+    {
     }
 
-    public function testSend(){
-        $status = (new Mailer(new Logger('Mailer')))
-            ->setServer('smtp.ym.163.com', 25)
-            ->setAuth('bot@ym.txthinking.com', '') // email, password
-            ->setFrom('Tom', 'bot@ym.txthinking.com') // your name, your email
-            ->setFakeFrom('张全蛋', 'zhangquandan@hello.com') // a fake name, a fake email
-            ->addTo('Cloud', 'cloud@txthinking.com')
-            ->setSubject('hello '. time())
+    public function testSend()
+    {
+        $mail = new Mailer(new Logger('Mailer'));
+        $status = $mail->setServer(self::SERVER, self::PORT_TLS, 'tls')
+            ->setAuth(self::USER, self::PASS) // email, password
+            ->setFrom(self::FROM_NAME, self::FROM_EMAIL) // your name, your email
+            //->setFakeFrom('张全蛋', 'zhangquandan@hello.com') // a fake name, a fake email
+            ->addTo(self::TO_NAME, self::TO_EMAIL)
+            ->addCc(self::CC_NAME, self::CC_EMAIL)
+            ->addBcc(self::BCC_NAME, self::BCC_EMAIL)
+            ->setSubject('Test Mailer '. time())
             ->setBody('Hi, boy')
-            ->addAttachment('host', '/etc/hosts')
+            ->addAttachment('test', __FILE__)
             ->send();
         $this->assertTrue($status);
+        usleep(self::DELAY);
     }
 
 }
diff --git a/tests/OAuthTest.php b/tests/OAuthTest.php
new file mode 100644
index 0000000..c9a55d5
--- /dev/null
+++ b/tests/OAuthTest.php
@@ -0,0 +1,30 @@
+<?php
+
+use \Tx\Mailer;
+use \Tx\Mailer\SMTP;
+use \Tx\Mailer\Message;
+use \Tx\Mailer\Exceptions\SMTPException;
+use \Monolog\Logger;
+
+class OAuthTest extends TestCase
+{
+    public function testOAuth2()
+    {
+        if(!self::OAUTH_TOKEN){
+            return;
+        }
+        $mail = new Mailer(new Logger('Mailer.OAuth'));
+        $status = $mail->setServer(self::OAUTH_SERVER, self::OAUTH_PORT, 'tls')
+            ->setOAuth(self::OAUTH_TOKEN)
+            ->setFrom(self::OAUTH_FROM_NAME, self::OAUTH_FROM_EMAIL)
+            ->addTo(self::TO_NAME, self::TO_EMAIL)
+            ->addCc(self::CC_NAME, self::CC_EMAIL)
+            ->addBcc(self::BCC_NAME, self::BCC_EMAIL)
+            ->setSubject('Test Mailer OAuth2'. time())
+            ->setBody('Hi, boy')
+            ->addAttachment('test', __FILE__)
+            ->send();
+        $this->assertTrue($status);
+    }
+}
+
diff --git a/tests/SMTPTest.php b/tests/SMTPTest.php
index de257ac..1e885cd 100644
--- a/tests/SMTPTest.php
+++ b/tests/SMTPTest.php
@@ -8,7 +8,7 @@
 
 use Tx\Mailer\SMTP;
 use Tx\Mailer\Message;
-use ERB\Testing\Tools\TestHelper;
+use \Monolog\Logger;
 
 /**
  * Class SMTPTest
@@ -17,7 +17,8 @@
  * This test set requires the use of an open SMTP server mock.  Currently, I'm using FakeSMTPServer
  *
  */
-class SMTPTest extends TestCase {
+class SMTPTest extends TestCase
+{
 
     /**
      * @var SMTP
@@ -25,66 +26,97 @@ class SMTPTest extends TestCase {
     protected $smtp;
 
     /**
-     * @var TestHelper
+     * @var  Message
      */
-    protected $testHelper;
+    protected $message;
 
     public function setup()
     {
-        $this->smtp = new SMTP();
-        $this->testHelper = new TestHelper();
-
+        $this->message = new Message();
+        $this->message
+            ->setFrom(self::FROM_NAME, self::FROM_EMAIL) // your name, your email
+            //->setFakeFrom('Hello', 'bot@fakeemail.com') // a fake name, a fake email
+            ->addTo(self::TO_NAME, self::TO_EMAIL)
+            ->addCc(self::CC_NAME, self::CC_EMAIL)
+            ->addBcc(self::BCC_NAME, self::BCC_EMAIL)
+            ->setSubject('Test SMTP ' . time())
+            ->setBody('<h1>for test</h1>')
+            ->addAttachment('test', __FILE__);
+        usleep(self::DELAY);
     }
 
-    public function testSetServer()
+    public function testSend()
     {
-        $result = $this->smtp->setServer("localhost", "25", null);
-        $this->assertEquals('localhost', $this->testHelper->getPropertyValue($this->smtp, 'host'));
-        $this->assertEquals('25', $this->testHelper->getPropertyValue($this->smtp, 'port'));
-        $this->assertSame($this->smtp, $result);
+        $this->smtp = new SMTP(new Logger('SMTP'));
+        $this->smtp
+            ->setServer(self::SERVER, self::PORT)
+            ->setAuth(self::USER, self::PASS);
+
+        $status = $this->smtp->send($this->message);
+        $this->assertTrue($status);
+        usleep(self::DELAY);
     }
 
-    public function testSetAuth()
+    public function testTLSSend()
     {
-        $result = $this->smtp->setAuth('none', 'none');
+        $this->smtp = new SMTP(new Logger('SMTP.tls'));
+        $this->smtp
+            ->setServer(self::SERVER, self::PORT_TLS, 'tls')
+            ->setAuth(self::USER, self::PASS);
 
-        $this->assertEquals('none', $this->testHelper->getPropertyValue($this->smtp, 'username'));
-        $this->assertEquals('none', $this->testHelper->getPropertyValue($this->smtp, 'password'));
-        $this->assertSame($this->smtp, $result);
+        $status = $this->smtp->send($this->message);
+        $this->assertTrue($status);
+        usleep(self::DELAY);
     }
 
-    public function testMessage()
+    public function testTLSv10Send()
     {
-        $this->smtp->setServer("localhost", "25", null)
-            ->setAuth('none', 'none');
+        $this->smtp = new SMTP(new Logger('SMTP.tlsv1.0'));
+        $this->smtp
+            ->setServer(self::SERVER, self::PORT_TLS, 'tlsv1.0')
+            ->setAuth(self::USER, self::PASS);
 
-        $message = new Message();
-        $message->setFrom('You', 'nobody@nowhere.no')
-            ->setTo('Them', 'them@nowhere.no')
-            ->setSubject('This is a test')
-            ->setBody('This is a test part two');
+        $status = $this->smtp->send($this->message);
+        $this->assertTrue($status);
+        usleep(self::DELAY);
+    }
 
-        $status = $this->smtp->send($message);
+    public function testTLSv11Send()
+    {
+        $this->smtp = new SMTP(new Logger('SMTP.tlsv1.1'));
+        $this->smtp
+            ->setServer(self::SERVER, self::PORT_TLS, 'tlsv1.1')
+            ->setAuth(self::USER, self::PASS);
+
+        $status = $this->smtp->send($this->message);
         $this->assertTrue($status);
+        usleep(self::DELAY);
     }
 
+    public function testTLSv12Send()
+    {
+        $this->smtp = new SMTP(new Logger('SMTP.tlsv1.2'));
+        $this->smtp
+            ->setServer(self::SERVER, self::PORT_TLS, 'tlsv1.2')
+            ->setAuth(self::USER, self::PASS);
+
+        $status = $this->smtp->send($this->message);
+        $this->assertTrue($status);
+        usleep(self::DELAY);
+    }
 
     /**
      * @expectedException \Tx\Mailer\Exceptions\SMTPException
      */
     public function testConnectSMTPException()
     {
-        $this->smtp->setServer("localhost", "99999", null)
+        $this->smtp = new SMTP(new Logger('SMTP.FakePort'));
+        $this->smtp
+            ->setServer('localhost', "99999", null)
             ->setAuth('none', 'none');
-        $message = new Message();
-        $message->setFrom('You', 'nobody@nowhere.no')
-            ->setTo('Them', 'them@nowhere.no')
-            ->setSubject('This is a test')
-            ->setBody('This is a test part two');
-
-        $this->smtp->send($message);
 
+        $this->smtp->send($this->message);
+        usleep(self::DELAY);
     }
 
-
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index d3479f4..d3b2495 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,5 +1,44 @@
 <?php
-// someday if you want do init action before testing
-class TestCase extends \PHPUnit_Framework_TestCase{
+
+/**
+ * Configures the SMTP server used for testing
+ */
+class TestCase extends \PHPUnit_Framework_TestCase
+{
+    /** SMTP server to test against */
+    const SERVER = 'smtp.mailtrap.io';
+    /** plain text port */
+    const PORT = 2525;
+    /** TLS port */
+    const PORT_TLS = 465;
+    /** SSL port (not supported by mailtrap currently */
+    const PORT_SSL = 0;
+    /** user for LOGIN auth */
+    const USER = 'e3f534cfe656f4';
+    /** password for LOGIN auth */
+    const PASS = 'b6e38ddc0f1e9d';
+
+    /** from */
+    const FROM_NAME = 'Mailer';
+    const FROM_EMAIL = '739f35c64d-9422d2@inbox.mailtrap.io';
+    /** to */
+    const TO_NAME = 'Test To';
+    const TO_EMAIL = 'cloud@txthinking.com';
+    /** cc */
+    const CC_NAME = 'Test Cc';
+    const CC_EMAIL = 'cloud+cc@txthinking.com';
+    /** bcc */
+    const BCC_NAME = 'Test Bcc';
+    /** email of receiver */
+    const BCC_EMAIL = 'cloud+bcc@txthinking.com';
+
+    /** delay in microsends between SMTP tests to avoid API limits (we're allowed two messages/second) */
+    const DELAY = 500000; // half a second
+
+    const  OAUTH_SERVER = 'smtp.gmail.com';
+    const  OAUTH_PORT = '587';
+    const  OAUTH_TOKEN = '';
+    const  OAUTH_FROM_NAME = 'Cloud';
+    const  OAUTH_FROM_EMAIL = 'cloud@txthinking.com';
 }