datatable.directory/app/Notifications/ConfirmEmail.php

<?php

namespace App\Notifications;

use App\Models\User;
use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Lang;

class ConfirmEmail extends Notification
{
    /**
     * The email confirm token.
     *
     * @var string
     */
    public $token;

    /**
     * The new e-mail
     *
     * @var string
     */
    public $newEmail;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct($newEmail, $token)
    {
        $this->newEmail = $newEmail;
        $this->token = $token;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['mail'];
    }

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        /** @var User $notifiable */
        $notifiable->email = $this->newEmail; // hack to send to the new e-mail

        return (new MailMessage)
            ->subject('E-Mail Confirmation')

            ->line(
                'Please confirm that you just requested using this e-mail with the datatable.directory
                account '.$notifiable->handle.'. It will be used to login, to recover forgotten passwords,
                and for sending notifications. You can always opt out of e-mail notifications in the settings.')

            ->action('Confirm E-Mail', url(config('app.url').route('confirm-email', ['token' => $this->token], false)))

            ->line(
                'If you did not request this action, no further action is required. The confirmation link
                 will expire in a few hours.');
    }
}