invoiceninja/app/Mail/Import/ImportCompleted.php

<?php

namespace App\Mail\Import;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class ImportCompleted extends Mailable
{
    // use Queueable, SerializesModels;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public $data;

    public function __construct($data)
    {
        $this->data = $data;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->from(config('mail.from.address'), config('mail.from.name'))
                    ->view('email.import.completed', $this->data);
    }
}