What is the difference between opt-in and opt-out when it comes email signups?

Opt-in - individuals have to actively choose to join the email list.

Opt-out - individuals join the list automatically and have to actively choose to be removed from the email list

We are doing opt-in so that your group members have the opportunity to actively decide if they want to be on the national list. That said, for any members that opt-in and change their mind, they're always able to unsubscribe.