Saved from https://laravel-news.com/allowing-users-to-send-email-with-their-own-smtp-settings-in-laravel

mail

$transport = new Swift_SmtpTransport('SMTP-HOST-HERE', SMTP-PORT-HERE);
$transport->setUsername('SMTP-USERNAME-HERE');
$transport->setPassword('SMTP-PASSWORD-HERE');

// extra configurations here if needed

Then, we use the Swift_SmtpTransport to build our Swift_Mailer object.

$swift_mailer = new Swift_Mailer($transport);

$view = app()->get('view');
$events = app()->get('events');
$mailer = new Mailer($view, $swift_mailer, $events);

$mailer->alwaysFrom('from-email', 'from-name');
$mailer->alwaysReplyTo('from-email', 'from-name');


$mailer->to('recipient')->send(new SomeMailable());


// AppServiceProvider.class

public function register()
{
 $this->app->bind('user.mailer', function ($app, $parameters) {
  $smtp_host = array_get($parameters, 'smtp_host');
  $smtp_port = array_get($parameters, 'smtp_port');
  $smtp_username = array_get($parameters, 'smtp_username');
  $smtp_password = array_get($parameters, 'smtp_password');
  $smtp_encryption = array_get($parameters, 'smtp_encryption');

  $from_email = array_get($parameters, 'from_email');
  $from_name = array_get($parameters, 'from_name');

  $from_email = $parameters['from_email'];
  $from_name = $parameters['from_name'];

  $transport = new Swift_SmtpTransport($smtp_host, $smtp_port);
  $transport->setUsername($smtp_username);
  $transport->setPassword($smtp_password);
  $transport->setEncryption($smtp_encryption);

  $swift_mailer = new Swift_Mailer($transport);

  $mailer = new Mailer($app->get('view'), $swift_mailer, $app->get('events'));
  $mailer->alwaysFrom($from_email, $from_name);
  $mailer->alwaysReplyTo($from_email, $from_name);

  return $mailer;
 });
 
 $configuration = [
 'smtp_host'    => 'SMTP-HOST-HERE',
 'smtp_port'    => 'SMTP-PORT-HERE',
 'smtp_username'  => 'SMTP-USERNAME-HERE',
 'smtp_password'  => 'SMTP-PASSWORD-HERE',
 'smtp_encryption'  => 'SMTP-ENCRYPTION-HERE',

 'from_email'    => 'FROM-EMAIL-HERE',
 'from_name'    => 'FROM-NAME-HERE',
];

$mailer = app()->makeWith('user.mailer', $configuration);

// Use $mailer here...



class UserMailerJob implements ShouldQueue
{
  use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

  public $configuration;
  public $to;
  public $mailable;

  /**
  * Create a new job instance.
  *
  * @param array $configuration
  * @param string $to
  * @param Mailable $mailable
  */
  public function __construct(array $configuration, string $to, Mailable $mailable)
  {
    $this->configuration = $configuration;
    $this->to = $to;
    $this->mailable = $mailable;
  }

  /**
  * Execute the job.
  *
  * @return void
  */
  public function handle()
  {
    $mailer = app()->makeWith('user.mailer', $this->configuration);
    $mailer->to($this->to)->send($this->mailable);
  }
}

$configuration = [
 'smtp_host'    => 'SMTP-HOST-HERE',
 'smtp_port'    => 'SMTP-PORT-HERE',
 'smtp_username'  => 'SMTP-USERNAME-HERE',
 'smtp_password'  => 'SMTP-PASSWORD-HERE',
 'smtp_encryption'  => 'SMTP-ENCRYPTION-HERE',

 'from_email'    => 'FROM-EMAIL-HERE',
 'from_name'    => 'FROM-NAME-HERE',
];

UserMailerJob::dispatch($configuration, 'recipient', new SomeMailable());