Emails not sending
 

Hey

This is pretty urgent since users don't receive emails after registration or when using forgot password.
Also email notification for topics not working.

I didn't do any changes to the forum, this error just appeared from nowhere.

I ran email test @ diagnostics in Admin CP and that is working!

I updated to 3.8.5 and still have the problem.
The forum is medium with 155,000 posts but I'm running a dedicated server.