Laravel queue:work not behaving same as queue:listen - laravel-8

Question

<?php
namespace App\Notifications;
use Illuminate\Notifications\Channels\MailChannel;
use Illuminate\Notifications\Notification;
use Illuminate\Support\Facades\Config;
class DynamicEmailChannel extends MailChannel
{
public function send($notifiable, Notification $notification)
{
$service = $notification->service;
$customConfig = [];
$from = [];
if ($service->sender_email && $service->sender_password) {
$customConfig = [
'transport' => 'smtp',
'host' => 'smtp.googlemail.com',
'port' => 587,
'encryption' => 'tls',
'username' => $service->sender_email,
'password' => $service->sender_password,
'timeout' => null,
'auth_mode' => null,
];
$from = [
'address' => $service->sender_email,
'name' => $service->title
];
} else {
$customConfig = [
'transport' => 'smtp',
'host' => env('MAIL_HOST', 'smtp.mailgun.org'),
'port' => env('MAIL_PORT', 587),
'encryption' => env('MAIL_ENCRYPTION', 'tls'),
'username' => env('MAIL_USERNAME'),
'password' => env('MAIL_PASSWORD'),
'timeout' => null,
'auth_mode' => null,
];
$from = [
'address' => env('MAIL_FROM_ADDRESS', 'hello#example.com'),
'name' => env('MAIL_FROM_NAME', 'Example')
];
}
Config::set('mail.mailers.smtp', $customConfig);
Config::set('mail.from', $from);
app()->forgetInstance('mail.manager');
parent::send($notifiable, $notification);
}
}
this program works when run through php artisan queue:listen but the app()->forgetInstance('mail.manager'); runs only once when run through php artisan queue:work. How do i make it behave as with queue:listen?
I am trying to send mail notifications through credentials saved in database.
If i am not wrong, if i delete the 'mail.manager' serviceInstance, it will create new one when called with latest config. it works the same way for queue:listen but not for queue:work. what am i missing, or not understanding here.

Answer 1

After doing some digging replacing app()->forgetInstance('mail.manager'); with Mail::purge('smtp'); solved the issue.