Can't add an email as get the message the email is in the system
When an email is changed the email is not deleted in the system
THIS IS A BUG
To fix this go into the wordpress backend go the the network sites
https://getsready.net/wp-admin
login as testy
then go to My Sites menu, then select Network admin, dashboard
go to Users menu search for the email
delete the user
go to the local site they are using and make sure it is not on their site
I like to test it too by changing the email to the new one but of course then you cant change it back unless you do the whole delete the email user from the network (as abov)