I'm just wondering, if I were to add a new email address to two lists with double opt-in, would that send two emails to the subscriber? I'm just trying to segment the user data a little but don't want to send out 101 double opt in emails ;)
If you are using a single form, and adding a person to two or more lists at once, then we combine the opt-in confirmations into a single email, so once click opts them in to all the lists.
You can of course just use custom fields in a single list and then segment your list based on those fields.
Thanks for clearing that up for me Mathew, I'm looking to use the custom fields for future management but I was asked it by the client the other day so wanted to confirm.