Email not being sent with Swift Mailer using Gmail SMTP - php

Question

I am trying to send emails from Swift Mailer using Gmail SMTP. It sends the emails conveniently for some time but then stops sending them altogether especially when I resume working after a day or so. It displays the following error:
Connection could not be established with host smtp.gmail.com [ #0]
Below is my sample code that I am using to send the email:
<?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', 465, 'ssl')
->setUsername('myemail#gmail.com')
->setPassword('appPassword');
//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();
}
?>
I am using App Password and I have enabled two-step verification in my Google Account Settings. I have been looking for a solution to this problem for a while now and i have already gone through many other related posts but didn't find a solution. Someone please suggest a permanent solution.
Thanks in advance.

Answer 1

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