Smtp config not working

Hi the community,

I have a problem on smtp configuration of application web Laravel. I have this error when I want to send email via a command line:

Symfony\Component\Mailer\Exception\TransportException

  Connection could not be established with host "ssl0.ovh.net:587": stream_socket_client(): Unable to connect to ssl0.ovh.net:587 (Connection refused)

  at vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php:154
    150▕         $streamContext = stream_context_create($options);
    151▕
    152▕         $timeout = $this->getTimeout();
    153▕         set_error_handler(function ($type, $msg) {
  ➜ 154▕             throw new TransportException(sprintf('Connection could not be established with host "%s": ', $this->url).$msg);
    155▕         });
    156▕         try {
    157▕             $this->stream = stream_socket_client($this->url, $errno, $errstr, $timeout, \STREAM_CLIENT_CONNECT, $streamContext);
    158▕         } finally {

  1   [internal]:0
      Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream::Symfony\Component\Mailer\Transport\Smtp\Stream\{closure}("stream_socket_client(): Unable to connect to ssl0.ovh.net:587 (Connection refused)", "/home/ulydebp/rent-reminder/vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php")
      +13 vendor frames

  15  app/Console/Commands/TestSendEmailCommand.php:30
      Illuminate\Mail\PendingMail::send(Object(App\Mail\TestEmail))

I also tried to use Gmail's smtp, same result.

Here are the different configurations on the server:

• pro hosting with PHP 8.2
• application web with Laravel 11
• my .env content:

MAIL_MAILER=smtp
MAIL_HOST=ssl0.ovh.net
MAIL_PORT=587
MAIL_USERNAME="EMAIL_DOMAIN"
MAIL_PASSWORD="PASSWORD_EMAIL_DOMAIN"
MAIL_ENCRYPTION=tls

I also called the support team, who unfortunately didn't help me any more than that. They sent me to this url https://help.ovhcloud.com/csm/fr-web-hosting-monitoring-automatic-emails?id=kb_article_view&sysparm_article=KB0052902#envoi-de-mails-a-laide-dun-script-smtp 

An idea of what I could do would be most welcome.

Thanks in advance