diff --git a/README.md b/README.md
index c7fae07..0c66212 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ composer require snipworks/php-smtp
 use Snipworks\Smtp\Email;
 
 $mail = new Email('smtp.example.com', 25);
-$mail->setLogin('sender@example.com', 'password');
+$mail->setLogin('sender@example.com', 'password', false);  // set 3rd parameter to true to use PLAIN auth instead of LOGIN auth
 $mail->addTo('recipient@example.com', 'Example Receiver');
 $mail->setFrom('example@example.com', 'Example Sender');
 $mail->setSubject('Example subject');
@@ -38,7 +38,7 @@ use Snipworks\Smtp\Email;
 
 $mail = new Email('smtp.example.com', 587);
 $mail->setProtocol(Email::TLS);
-$mail->setLogin('sender@example.com', 'password');
+$mail->setLogin('sender@example.com', 'password', false);  // set 3rd parameter to true to use PLAIN auth instead of LOGIN auth
 $mail->addTo('recipient@example.com', 'Example Receiver');
 $mail->setFrom('example@example.com', 'Example Sender');
 $mail->setSubject('Example subject');
@@ -67,7 +67,7 @@ define('SMTP_PRIMARY_PASSWORD', 'my very secret password');
 
 require_once('config.php');
 // ...
-$mail->setLogin(SMTP_PRIMARY_EMAIL, SMTP_PRIMARY_PASSWORD);
+$mail->setLogin(SMTP_PRIMARY_EMAIL, SMTP_PRIMARY_PASSWORD, false);
 // ...
 ```
 
diff --git a/src/Email.php b/src/Email.php
index 3bdb015..2990d69 100644
--- a/src/Email.php
+++ b/src/Email.php
@@ -33,6 +33,9 @@ class Email
     /** @var string $password */
     protected $password;
 
+    /** @var bool $plain_auth */
+    protected $plain_auth;
+
     /** @var int $connectionTimeout */
     protected $connectionTimeout;
 
@@ -195,10 +198,11 @@ public function addAttachment($attachment)
      * @param string $password
      * @return Email
      */
-    public function setLogin($username, $password)
+    public function setLogin($username, $password, $plain_auth = false)
     {
         $this->username = $username;
         $this->password = $password;
+        $this->plain_auth = $plain_auth;
 
         return $this;
     }
@@ -327,9 +331,15 @@ public function send()
             $this->logs['HELLO'][2] = $this->sendCommand('EHLO ' . $this->hostname);
         }
 
-        $this->logs['AUTH'] = $this->sendCommand('AUTH LOGIN');
-        $this->logs['USERNAME'] = $this->sendCommand(base64_encode($this->username));
-        $this->logs['PASSWORD'] = $this->sendCommand(base64_encode($this->password));
+        if ($this->plain_auth) {
+            $this->logs['AUTH'] = $this->sendCommand('AUTH PLAIN');
+            $this->logs['AUTH_PLAIN'] = $this->sendCommand(base64_encode( "\0". $this->username ."\0". $this->password ));
+        } else {
+            $this->logs['AUTH'] = $this->sendCommand('AUTH LOGIN');
+            $this->logs['USERNAME'] = $this->sendCommand(base64_encode($this->username));
+            $this->logs['PASSWORD'] = $this->sendCommand(base64_encode($this->password));
+        }
+        
         $this->logs['MAIL_FROM'] = $this->sendCommand('MAIL FROM: <' . $this->from[0] . '>');
 
         $recipients = array_merge($this->to, $this->cc, $this->bcc);