Alright, thanks a lot for you explanations, I made some changes about my heroku config. Yes, I definitely misunderstood some parts about env function but now it’s fine thanks to you.
But it seems that I missed something because “forgot email” template has been changed but the email that I received using the provider sendgrid or Amazon was the default message. I had the same behaviour in develop mode.
Did I miss something else about the configuration ?
Thanks a lot for your help.