So first you have to run a artisan command for create mail file.

php artisan make:mail TestMail

After that there will create a php file on -

app\Mail\TestMail.php

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Mail\Mailables\Content;
use Illuminate\Mail\Mailables\Envelope;
use Illuminate\Queue\SerializesModels;

class TestMail extends Mailable
{
    use Queueable, SerializesModels;
    public $data;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct($data)
    {
        $this->data = $data; 
    }

    /**
     * Get the message envelope.
     *
     * @return \Illuminate\Mail\Mailables\Envelope
     */
    public function envelope()
    {
        return new Envelope(
            subject: 'Your Company Account Created Successfully!',
        );
    }

    /**
     * Get the message content definition.
     *
     * @return \Illuminate\Mail\Mailables\Content
     */
    public function content()
    {
        return new Content(
            view: 'mails.test_mail',
        );
    }

    /**
     * Get the attachments for the message.
     *
     * @return array
     */
    public function attachments()
    {
        return [];
    }
}

Here you can pass data using __constructor() function.

Now another command for create a controller for call this mail.

php artisan make:controller TestMailController

Then it will create a controller on -

app\Http\Controllers\TestMailController.php

Add this to your email controller. Here you get $data array. You now can pass all of your data for sending through email.

//Use this on top
use Illuminate\Support\Facades\Mail;
use App\Mail\TestMail;

//Use this on Controller
$data = [
            'name' => "Arman Rahman",
        ];

        $mail = new TestMail($data);
        Mail::to($user->email)->send($mail);

Then create blade file with your email html template.

resources\views\mails\test_mail.blade.php

<!DOCTYPE html>
<html>
<head>
    <title>Test Mail</title>
    <style>
        body {
            color: red;
        }
    </style>
</head>
<body>
    <p>Hello {{ $data['name'] }}!!</p>

</body>
</html>

Your Basic Setup is now finished. Now set your .env file.

MAIL_MAILER=smtp
MAIL_HOST=
MAIL_PORT=
MAIL_USERNAME=
MAIL_PASSWORD=
MAIL_ENCRYPTION=
MAIL_FROM_ADDRESS=
MAIL_FROM_NAME="${APP_NAME}"

Create Your company email with Cpanel

Create Email From Cpanel:

Click On Connect Device:

After That Get your mail confederation details from here:

Fill your .env Like this:

MAIL_MAILER=smtp
MAIL_HOST= [Incoming Server: mail.yourdomain.com]
MAIL_PORT= [Outgoing Server: SMTP Port: 465]
MAIL_USERNAME= [Username: youremail@yourdomain.com]
MAIL_PASSWORD= [Password: Your Email Password]
MAIL_ENCRYPTION= ssl
MAIL_FROM_ADDRESS= [Username: youremail@yourdomain.com]
MAIL_FROM_NAME="${APP_NAME}"

Now write your logic on controller and send mail.

Laravel 9 Mail Send Using Cpanel