Is it possible to disable email requirement for new users registrations?

I am trying to keep it so the forum allows for anonymous users.

Having email address is the mandatory condition for miniBB-forum members. It is required in many other modules, so if you disable it, you may to update lots of scripts.

To keep the board for guests, you don't have to register members at all. miniBB allows guest posting by default (type a username with no password if it's not registered and you're done).

Thanks a lot Paul, I will instruct new members to just use a fake email if they don't want to give their real one away then!

Yes, this is a solution as well - here on our forums, we also don't require to confirm a valid email.
But this record should be put in database, even if it's invalid.