Symfony 4 - 使用ionos发送电子邮件

Question

For several hours, I can not send mail with Symfony 4. Currently, I am hosted at IONOS and I wish to send emails through my email present in the host. Symfony is sending me the following error:

Uncaught PHP Exception Swift_TransportException: "Connection could not be established with host localhost [Connection timed out # 110].

I want the emails to send directly so I commented on the content of the swiftmailer.yaml

#swiftmailer:
    # ...
    # spool: { type: memory }

#.env
    # APP_ENV=prod
    # MAILER_URL=smtp://imap.ionos.fr:993?encryption=ssl&auth_mode=login&username=mail&password=passwordmail


#Controller
    # $message = (new \Swift_Message('Youpi Email'))
    # ->setFrom(mail)
    # ->setTo('[e-mail]')
    # ->setBody($params['message'],'text/plain')
    # $this->get('mailer')->send($message);

IONOS email configuration is here :

Mail configuration IONOS

Thank you a lot for your responses !