invoiceninja/app/Mail/VerifyUser.php

<?php

namespace App\Mail;

use App\Models\User;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;

class VerifyUser extends Mailable implements ShouldQueue
{
    use Queueable, SerializesModels;

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

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {

        return $this->from('turbo124@gmail.com') //todo
            ->subject(ctrans('texts.confirmation_subject'))
            ->markdown('email.auth.verify', ['user' => $this->user])
            ->text('email.auth.verify_text');
    }
}