Set up Regal Forms newsletter integrations
Updated September 20, 2026
Regal Forms newsletter integrations let you collect an explicit newsletter choice and send only opted-in contacts to Klaviyo, Mailchimp, or both. This keeps marketing consent separate from a general contact-form submission.
Set up Regal Forms newsletter integrations#
- Open Regal Forms → Settings and save your Klaviyo private API key and/or Mailchimp API key. Saved keys are protected and are not shown again.
- Edit the form, add an Email field and a Join Newsletter field. Add the dedicated Name field if you want to send first and last names.
- Open Form settings. Enable Klaviyo and/or Mailchimp in the Newsletter integrations cards.
- Map the Join Newsletter, Email and optional Name fields, then enter the Klaviyo list ID or Mailchimp audience ID.
- Choose the opt-in method and save the form.
Choose single or double opt-in#
For Mailchimp, single opt-in immediately subscribes a new contact after they tick the Join Newsletter field. Double opt-in sends the contact a confirmation email and keeps them pending until they confirm.
For Klaviyo, Regal Forms records the selected method as a clear configuration check. Klaviyo applies the actual behaviour from the selected list: use a single-opt-in list for immediate subscription or a double-opt-in list to send a confirmation email. Make the choice in Regal Forms match the list setting.
Important checks#
- Only contacts who tick the selected Join Newsletter field are sent to the enabled provider.
- Use an API key with the provider permissions required to add profiles and subscriptions.
- Enter the provider list or audience identifier, not its display name.
- A provider error never prevents the form entry from being saved or its confirmation from being shown.
For provider-side opt-in settings, see the Klaviyo consent API guidance and Mailchimp signup preference guidance.
Builder update: Klaviyo and Mailchimp now sit together in one Newsletter integrations card. When an Email field is available, Regal Forms selects it automatically, while still allowing you to choose a different Email field. Klaviyo confirmation behaviour is controlled by its selected list; Mailchimp exposes the single or double opt-in choice in the form builder.
