Prata it appears that you haven’t configured the “From” field in your e-mail settings:
flarum.ERROR: Swift_TransportException: Cannot send message without a sender address
This means that when users are alerted by e-mail that their post was filtered, the e-mail never arrives and an error is shown. I have fixed this by setting the “Addresses” in your E-mail settings to the default noreply+...@freeflarum.com address that FreeFlarum uses. Could you please check if that fixed the issue?
