Sending mail Laravel + Mailcatcher

Hi guys,

First, I'm sorry for my english.

I'm training on Laravel, and I want to send mail in local. For this, I downloader MailCatchers, and tried to send a mail like this :

public function contact(){
       Mail::send('auth.emails.contact', ['username' => 'test'], function($message){
           $message->to('[email protected]')->subject('Welcome');
       });
    }

But here, I have an error "Cannot send a message without a sender adress". I don't know what to do for resolve this error.

If you want, my mail.php file :

'driver' => env('MAIL_DRIVER', 'smtp'),
'host' => env('MAIL_HOST', 'smtp.mailgun.org'),
'port' => env('MAIL_PORT', 587),
'from' => ['address' => null, 'name' => null],
'encryption' => false,
'username' => env('MAIL_USERNAME'),
'password' => env('MAIL_PASSWORD'),
'sendmail' => '/usr/sbin/sendmail -bs',

And the mail part of my .env file

MAIL_DRIVER=smtp
MAIL_HOST=localhost
MAIL_PORT=1025
MAIL_USERNAME=null
MAIL_PASSWORD=null

Well, thank you in advance if you have an idea that can help me to resolve my problem !