Try this plugin: https://wordpress.org/plugins/manage-notification-emails/

For further support please open a new support topic in WordPress forum.

wpForo doesn't have any relation to this issue.

Just to confirm, I have just disabled wpforo again and the email has stopped when a new user signs up to the website. There must be a way of disabling this email?

We are making circles here. It doesn't come from wpForo and wpForo doesn't SET ANY PASSWORDS.

All those come from Wordpress core or some other plugin you may have.

When a new user signs in, one email is send to the admin and one to the user to set his password.

So why is forum and foro mentioned in the email URL? and it stops when I disable wpforo?

https://www. *.co.uk/forums/?foro=resetpassword&rp_key=djST6tlrXzv5WVRtXzvp&rp_login=*

wpForo doesn't SET any password.

Yes there are 2 emails when a users signs up, first email is confirm email address and 2nd is set password email from wpforo. 

The password has already been created, when the user signs up they input there password so there is no need for the second email.

Thanks

It is unclear what you issue is. Is the user geting TWO SAME emails?

The user

Also the reason I'm trying to disable this email is because I already receive the main registration email from Wordpress so it's a bit annoying have 2 emails registration emails come through.