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#

  1. 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.
  2. 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.
  3. Open Form settings. Enable Klaviyo and/or Mailchimp in the Newsletter integrations cards.
  4. Map the Join Newsletter, Email and optional Name fields, then enter the Klaviyo list ID or Mailchimp audience ID.
  5. 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.

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