How to opt-out for a Marketing Campaign?
We have setup that a user who contactus trough the web contactus page becomes a lead (this is by default). Then the e-mail address of that lead will go to the marketing campaign. The marketing campaign starts with sending a thank you e-mail. After x days another mail and so on. But mails send from the marketing campaign do not have a pt-out function.
How can a user opt-out for a marketing campaign?