I cant send an email it always throws error 500

[Paulvincent1]

    $mail = new Mail;
   $mail->using($refreshToken)->to($fields['email'])
        ->from('sumalinog1124@gmail.com', 'Paul Vincent Sumalinog')
        ->subject('Verification Code');

        dd($mail->send()); //whenver this code hits it will throw 500 

    $mail->using($refreshToken)->to($fields['email'])
        ->from(env('MAIL_FROM_ADDRESS'), env('MAIL_FROM_NAME'))
        ->subject('Verification Code')
        ->markdown('mail.send-code', [
        'emailVerification' => $emailVerification,
         ]) // 👈 use string
        ->send();