Techout592 Yep it's just for my user. My other user (logged in with discord) worked fine
That's strange... Perhaps your mailbox refuses the mail? That's all I can think of, as specific user accounts shouldn't have mail errors?
Techout592 It's not my mail server though as I have just received some emails. So not sure why it's doing this
The mail setup for your forum is the default FreeFlarum's mail server (not a custom one, as the IP is 127.0.0.1). So it might be a bug in FreeFlarum too, although I don't think that as other users can receive mail alright.
What about logging in with Discord? Does that work?