Sorry for not being clear enough. As mentioned I know that the email fields can be enabled to validate that particular field
but what I am asking is there any way that a custom email field can be validated to the main system email field.
There are up to 4 different membership plans shown at registration and I have had to add a separate custom email field for each membership plan which is controlled as to which membership group and members can view and access it by CB Subs field tabs protect. This can't be done using only the main system email field. It would be helpful if this custom field could be validated to the main system email field to pick up a wrong email address being entered.
Hope this is clearer, thanks.