Configure email transporter in CakePHP in runtime

config_email_transporter_in_cakephp_runtime.php

<?php

Email::configTransport('transporter_name', [
            'className' => 'Smtp',
            'host' => 'SMTP_HOST',
            'port' => 'SMTP_PORT',
            'timeout' => 30,
            'username' => 'SMTP_USERNAME',
            'password' => 'SMTP_PASSWORD',
        ]);
        
        $email = new Email();
        $email->transport('transporter_name');
        
        $email->from('no-replay@example.com')
            ->to('to@example.com')
            ->subject('Dummy Subject')
            ->message('This is a test message')
            ->send();