Interval in for e-mail sending - laravel

Question

I made a system for sending e-mail but I need to put a interval in the send, today I only show the sending using an "echo" but if you have a progress it would be even better.
I don't know what the best way to do it when I tried to send with more than 3000 contacts was a timeout, but it remained sending.
I found function sleep, but I don't know if it would be suitable for the current code.
$locale = DB::table('email_contact')
->where('list_id','=',$list)
->get();
for($i = 0;$i < count($locale);$i++){
if($creditemail < count($locale)){
echo "you not credit!";
break;
}else{
$sender = $locale[$i];
$sending = $sender[$i]->email;
$name = $sender[$i]->name;
$mail = new PHPMailer(true);
try {
//Server settings
$mail->SMTPDebug = false;
$mail->isSMTP();
$mail->CharSet = 'UTF-8';
$mail->Host = 'host';
$mail->SMTPAuth = true;
$mail->Username = 'user';
$mail->Password = 'pass';
$mail->SMTPSecure = false;
$mail->Port = 587;
//Recipients
$mail->setFrom('mail#my.com', 'Mail - My');
$mail->addAddress($sending, $name); // Add a recipient
// Content
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = $subject;
$mail->Body = $text;
$mail->send();
$number = $i+1;
DB::table('users')
->where('id','=',Auth::id())
->decrement('email_credit', 1);
echo 'Sender: '.$number.'/'.count($locale)."<br>";
}catch (\Exception $e){
echo $e;
}
}
}

Answer 1

Use laravel mailer. You can easily add a delay there and also you can improve the code quality as well. Have a look at the documentation https://laravel.com/docs/7.x/mail
$when = now()->addMinutes(10);
Mail::to($request->user())
->cc($moreUsers)
->bcc($evenMoreUsers)
->later($when, new OrderShipped($order));