BoltMail
Can I unsubscribe a user from many contact lists at once?
An unsubscribe form, like a subscription form, can be used to unsubscribe your contacts from multiple lists by filling out the one form. This will allow you to customized your unsubscribe page.

When a contact unsubscribe by using "Unsubscribe Form", their unsubscribe statistics will not be captured in any of the "Newsletter Statistics", as the form itself is not associated with any of the newsletter.

If you'd like for the unsubscribe statistics to be captured for a certain campaign, you need to add "Unsubscribe Link" instead. By clicking the link a contact will get unsubscribed from the contact list that the campaign is sending to.