Torn between putting this down as a bug or feature - choosing the former because it is technically incorrect.
When registering on a forum that requires admin approval, the message when you sign up on the website says:
"You’re almost done! We sent an activation mail to [email]. Please follow the instructions in the email to activate your account.
If it doesn’t arrive, check your spam folder, or try to log in again to send another activation mail."
If approval is required, that email is not sent until an admin approves the account manually. This has caused confusion for some of my users because they think their registration was either not successful, or the email went into their spam folder (or just never arrived). I suggest the message is changed in this case to something clearer, e.g.:
“You’re almost done! Your account is awaiting approval from a member of staff. Once they’ve approved your account you’ll be sent further instructions by email.”
(or words to that effect - or even the ability to customise this).