WordPress: WPForms

Your WPForms forms keep working as they are; people who tick a newsletter box on them are also added to 404 Emails. Only their email address and name are sent.

1. In WPForms → All Forms, edit your form and add a Checkboxes field with one choice, for example "Yes, send me the newsletter" (or a GDPR Agreement field). Save.
2. Install the 404 Emails plugin: download it under Settings → Integrations → WordPress in 404 Emails, then in WordPress go to Plugins → Add New Plugin → Upload Plugin, choose the file and click Activate.
3. Open 404 Emails in the WordPress menu, click Connect to 404 Emails, sign in, choose your workspace and click Allow.
4. Go to 404 Emails → Other forms. Next to your form, choose the 404 Emails form in Add sign-ups to and that box in Who is added. Click Save.
5. Send the form once with the box ticked and check that the person appears in Contacts.

Only people who tick the box are subscribed. The wording they ticked is saved in 404 Emails as their consent.

Works with WPForms Lite and the paid versions.