invoiceninja/app/Mail/TestMailServer.php

<?php

namespace App\Mail;

use App\Utils\Ninja;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class TestMailServer extends Mailable
{
    use Queueable, SerializesModels;

    public $message;

    public $from_email;

    public function __construct($message, $from_email)
    {
        $this->message = $message;
        $this->from_email = $from_email;
    }

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

        return $this->from($this->from_email) //todo this needs to be fixed to handle the hosted version
            ->subject(ctrans('texts.email'))
            ->markdown('email.support.message', [
                'message' => $this->message,
                'system_info' => '',
                'laravel_log' => []
            ]);
            
    }
}