Using PHP'S Swiftmailer With Gmail

Email not being sent with Swift Mailer using Gmail SMTP

How to use Swift Mailer Using Gmail SMTP

Try this code like this:

<?php
    require_once 'lib/swift_required.php';
    try
    {
        echo '<pre>';
        //Generating the Email Content
        $message = Swift_Message::newInstance()
                    ->setFrom(array('myemail@gmail.com' => 'No Reply'))
                    ->setTo(array('recipient@gmail.com' => 'Recipient'))
                    ->setSubject('Test Email')
                    ->setBody("This is a Test Email to check SwiftMailer.");

        // Create the Mail Transport Configuration
        $transport = Swift_SmtpTransport::newInstance('smtp.gmail.com', 587, 'tls')
                    ->setUsername('myemail@gmail.com')
                    ->setPassword('appPassword')
                    ->setStreamOptions(array(
                     'ssl' => array(
                     'allow_self_signed' => true, 
                     'verify_peer' => false)));

        //local domain sending
        $transport->setLocalDomain('[127.0.0.1]');

        $mailer = Swift_Mailer::newInstance($transport);

        //Send the email
        $sentFlag = $mailer->send($message);
    }
    catch (Exception $e)
    {
        echo $e->getMessage();
    }

?>

Hope it helps

Swiftmailer config : send mail using gmail

Looks like your live server is missing OpenSSL, so you need to enable it in order to get secure connections working (i.e. enable the php_openssl module). Also check this question.

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