Slow mail sending with Laravel?

I'm doing some mass mailing tests but I'm finding the process being done with Laravel slower. The reason I found the submission slow was that I worked in a company where on average 50 ~ 60 thousand emails were sent around 10 to 12 hours. To test the procedure I am using only 10 and in a first test it took 45 seconds to finish the process.

PROJECT STRUCTURE

Laravel 5.4. *

PostgreSQL database to store the names and emails of pseudo subscribers, basically I use only one table with 5 fields (ID, NAME, EMAIL, CREATED_AT, UPDATED_AT).

Sending emails are being done with the Laravel queue system using redis. I took the initiative to use the PHPREDIS extension contrary to the standard that already comes with Laravel which is the Predis, I did this because of the performance being superior.

FLOW

Link on the home page calling a route

<div class="links">
    <a href="{{Route('enviarNews')}}">Enviar News</a>
</div>

The route calls this controller, which in turn calls a Job as you can see

<?php

namespace App\Http\Controllers;

use App\Jobs\MailJob;

class MailController extends Controller{

    public function enviarNews(){
        dispatch(new MailJob());

        return 'Sua newsletter está em processo de preparo e sera enviada em breve.';
    }

}

A Job, I'm calling the mail class.

<?php    
namespace App\Jobs;    
use Illuminate\Bus\Queueable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;    
use Illuminate\Support\Facades\Mail;
use App\MailModel;
use App\Mail\MailSend;   

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

    /**
     * Create a new job instance.         
     * @return void
     */
    public function __construct()
    {
    }    
    /**
     * Execute the job.         
     * @return void
     */
    public function handle()
    {
        $mails = MailModel::all();            
        foreach ($mails as $mail){
            Mail::to($mail->email)->send(new MailSend($mail));
        }
    }
}

MailSend and View class

<?php    
namespace App\Mail;    
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;
use App\MailModel;

class MailSend extends Mailable
{
    use Queueable, SerializesModels;    
    /**
     * Create a new message instance.
     * @return void
     */        
    public $mail;        
    public function __construct(MailModel $mail)
    {
        $this->mail = $mail;
    }    
    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->from("[email protected]", "Firemail Testes")
        ->subject("Testes de Envio em Massa")
        ->view('mail.news1');
    }
}

View

<p>Ola {{$mail->name}}, estamos testando o envio de emails em massa!</p>

That's what's being done, anything in my code may be slow shipping? For the accounts I made, with this current metric could only be sending about 19200 emails per day, well below the one I mentioned above and taking advantage, can this slowdown be caused by my SMTP server? for these tests am I using SMTP2GO ?

• Can it also be on my internet account? (But on average it runs at 30mb.)

• What can I do to improve this process and leave as soon as possible?