I have multiple lists but i am having a problem with subscribers.
I want them to subscribe but only to one list - sometimes i want to same email to many lists but i select 2 lists and there is a duplicate email between the two list, the software errors out.
I need a way to prevent the subscribers from joining multiple lists. I don't want them to receive the same email twice if they are in two lists.
It is only a few times that I send the same email to multiple list but I do need this option.

Thanks