How to send email from zend framework 3?

How to send email from zend framework3?

define('MR_MAIL_HOST','smtp.sendgrid.net');
define('MR_MAIL_PORT','587');//457,25
define('MR_MAIL_USERNAME','username');  
define('MR_MAIL_PASSWORD','password');  

$transport = new Mail\Transport\Smtp();
$options   = new Mail\Transport\SmtpOptions(array(
    'name'              => 'emailName',
    'host'              => MR_MAIL_HOST,
    'connection_class'  => 'login',
    'connection_config' => array(
        'username' => (MR_MAIL_USERNAME),
        'password' => (MR_MAIL_PASSWORD),
         'port' => MR_MAIL_PORT,
    ),
));
$transport->setOptions($options);

$mail = new Mail\Message();
$mail->setFrom('from@web-technology-experts-notes.in');
$mail->setSubject('This is simple subject');
$mail->setBody('this is html body text');
$mail->addTo('to@web-technology-experts-notes.in');
$transport->send($mail);

Zend Framework 3 Authentication

use Zend\Authentication\Adapter\DbTable\CredentialTreatmentAdapter as AuthAdapter;
use Zend\Authentication\AuthenticationService;
use Zend\Authentication\Storage\Session as SessionStorage;
            
$authAdapter = new AuthAdapter(
    $this->adapter,
    'admins',
    'email',
    'password',
     'md5(?)'
);

$authAdapter
    ->setIdentity($userName)
    ->setCredential($password);
$authResult = $authAdapter->authenticate();

if($authResult->isValid()){
    $result['success']=1;
    $identity=$authResult->getIdentity();

    //Save in session
    $adminDetails=$authAdapter->getResultRowObject(array('id','email'));
    $authService = new AuthenticationService();
    $authService->setStorage(new SessionStorage('AdminLogin'));
    $authService->getStorage()->write((array)$adminDetails);
}else{
    $messages = $authResult->getMessages();
    $result['msg'] =implode(' ',$messages);
}
    

HelpFul Links
https://github.com/zendframework/zend-authentication
https://github.com/zendframework/zend-authentication/blob/master/src/AuthenticationService.php