SwiftMailer test username and password - php

Question

I really don't know if this is about SwiftMailer or mailtrap.io but the problem is when I try to establish a SMTP connection to said service (mailtrap.io) I never get any errors, even if I don't use any username or password. Am I not supposed to get any authentication errors when not using any username or password? Or am I doing this the wrong way?
This is the method I use to test if the dynamic connection can be made before I store it in the .env file.
/**
* E-mail configuration
*
* #param Request $request
* #return \Illuminate\Routing\Redirector|\Illuminate\Http\RedirectResponse
*/
public function postEmailConfiguration(Request $request)
{
# Try connecting to the SMTP
try {
$encryption = $request->input('encryption');
if ($encryption == 'null') {
$encryption = NULL;
}
$transport = new Swift_SmtpTransport($request->input('host'), $request->input('port'), $encryption);
$transport->setUsername($request->input('username'));
$transport->setPassword($request->input('password'));
$mailer = new Swift_Mailer($transport);
$mailer->getTransport()->start();
# Update .env file
$this->setEnvironmentValues([
'MAIL_HOST' => $request->input('host'),
'MAIL_PORT' => $request->input('port'),
'MAIL_USERNAME' => $request->input('username'),
'MAIL_PASSWORD' => $request->input('password'),
'MAIL_ENCRYPTION' => $request->input('encryption')
]);
return redirect()->back()->with('success', 'Connection to SMTP establised and saved!');
}
# Could not connect to SMTP
catch (Swift_TransportException $e) {
return redirect()->back()->with('error', 'Could not connect to SMTP server.<br>Error: ' . $e->getMessage());
}
# Could not connect to SMTP
catch (Exception $e) {
return redirect()->back()->with('error', 'Could not connect to SMTP server.<br>Error: ' . $e->getMessage());
}
}

Answer 1

I tested a connection to Gmail with SwiftMailer 6 on Symfony 4.4 and the code below (it's similar to yours) works as expected for me.
So if you want to check if the connection is established without a message sending use the next code:
public function checkConnection()
{
try {
// Create the Transport
$transport = (new \Swift_SmtpTransport(
'smtp.gmail.com',
'587',
'tls'
))
->setUsername('your.username#gmail.com')
->setPassword('yourSuperPassword');
// Create the Mailer using your created Transport
$mailer = new \Swift_Mailer($transport);
$mailer->getTransport()->start();
return true;
} catch (\Swift_TransportException $e) {
return $e->getMessage();
} catch (\Exception $e) {
return $e->getMessage();
}
}
otherwise, it throws an exception:
Swift_TransportException:
Failed to authenticate on SMTP server with username "your.username#gmail.com" using 3 possible authenticators. Authenticator LOGIN returned Expected response code 235 but got code "535", with message "535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials z7sm3020898ljj.98 - gsmtp".
Authenticator PLAIN returned Expected response code 235 but got code "535", with message "535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials z7sm3020898ljj.98 - gsmtp".
Authenticator XOAUTH2 returned Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials z7sm3020898ljj.98 - gsmtp".