Can't send mail with Lumen framework and no error appears

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I have a problem with the Exceptions handler. By following this answer (which consists in adding a dd in the render function of Handler.php), I am now able to see what's going wrong.

So, here is the reason why my mail didn't send and why my page turned blank: Object of class Illuminate\Mail\Message could not be converted to string (View: /home/serveur-web/api.sl-projects.com/resources/views/emails/mailTemplate.blade.php).

The problem came from the fact that I was using the variable name $message, and this causes problems because it seems to be used in the class that handles the mails. My problem was therefore solved by renaming this variable $mailContent.

I hope this will help other people. :D