Actually somehow Actually, somehow the submission parameter on port 587 wasn’t present anymore in my postfix settings… And the TLS certificate wasn’t valid anymore… Anyway, I’ve forced to use port 25 without certificate. Its working again 🙂
@sosojni Your modification is working for me 🙂 Maybe you could made a fork of the nodebb-plugin-lightbox plugin with your modified file, you'll make a lot happy men here 🙂