1. Create a Thank You landing page.
2. Create a custom redirect to the Thank You landing page.
3. Send a list email that includes the redirect link to ask prospects to opt in to your list.
4. In the redirect report, select the prospects with at least one click, and add an “opted in” tag to them.
5. To remove prospects that haven’t responded or opted in, create and run an automation rule with the following criteria.Prospect list [is member of][email list name].Prospect tag [isn’t] [opted in].Completion action: Change prospect default field [Do Not Email] to [Do Not Email].
6. Prospect list [is member of][email list name].
7. Prospect tag [isn’t] [opted in].
8. Completion action: Change prospect default field [Do Not Email] to [Do Not Email].