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Documentation Index

Fetch the complete documentation index at: https://docs.sequenzy.com/llms.txt

Use this file to discover all available pages before exploring further.

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Double Opt-In

Double opt-in asks new subscribers to confirm their email address before they become active. Use it when you want cleaner lists, stronger consent records, and fewer fake or mistyped signups.

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How It Works

  1. A visitor submits a signup form, or an API call creates a subscriber with double opt-in enabled.
  2. Sequenzy stores the subscriber as unsubscribed while confirmation is pending.
  3. Sequenzy sends your confirmation email with a signed confirmation link.
  4. After the subscriber clicks the link, Sequenzy changes the subscriber to active.
  5. Sequenzy adds the subscriber to the target lists, applies signup tags, and triggers matching automations.
Pending subscribers do not receive campaigns or sequences. They can still receive the confirmation email because it is sent as a transactional confirmation message.

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Requirements

Before enabling double opt-in, set a default sender profile for the workspace. Sequenzy uses that sender for the confirmation email. When you enable double opt-in for the first time, Sequenzy creates a confirmation email template for you. You can edit it like any other email, but it must include the {{DOUBLE_OPT_IN_URL}} variable somewhere in the content. Sequenzy replaces that variable with the subscriber’s confirmation link at send time.

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Enable Double Opt-In

  1. Go to Settings → Email Tracking.
  2. Find Double Opt-In.
  3. Turn on Enable double opt-in.
  4. Click Edit confirmation email if you want to customize the subject, copy, design, or button text.
  5. Save your settings.
If the workspace does not have a default sender profile, Sequenzy will ask you to set one before enabling the setting.

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Signup Forms

Embedded signup forms follow the workspace double opt-in setting. When double opt-in is enabled:
  • Form submissions create pending subscribers with status: "unsubscribed"
  • Selected list IDs and tags are held until confirmation
  • The confirmation email is sent automatically
  • The success message or redirect still runs after the form submission succeeds
When the subscriber confirms, Sequenzy activates the subscriber, adds the selected lists and tags, and starts any matching automations.

Signup Form Widget

Learn how embedded signup forms work with double opt-in.

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API Behavior

The subscriber API accepts an optInMode field:
ValueBehavior
confirmedCreate or keep the subscriber active immediately when you have verified consent. This is the API default.
double_opt_inForce a confirmation email for this request. The subscriber stays unsubscribed until they confirm.
defaultFollow the workspace double opt-in setting.
Use confirmed for server-side flows where your app already verified consent, such as paid customer syncs or explicit in-product opt-ins. Use double_opt_in when the API call comes from an untrusted or public capture flow. 
curl -X POST "https://api.sequenzy.com/api/v1/subscribers" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "new-reader@example.com",
    "tags": ["newsletter"],
    "lists": ["list_abc123"],
    "optInMode": "double_opt_in"
  }'
If confirmation is required, the response includes an optIn object: 
{
  "success": true,
  "subscriber": {
    "id": "sub_abc123",
    "email": "new-reader@example.com",
    "status": "unsubscribed",
    "tags": []
  },
  "optIn": {
    "required": true,
    "emailQueued": true
  }
}

Create Subscriber API

See the full subscriber create request and response reference.
Confirmation links expire automatically. If a subscriber clicks an expired or replaced link, they see an error state and can submit the form again to receive a fresh confirmation email. If a subscriber is already active when they click a valid confirmation link, Sequenzy treats it as already confirmed instead of creating duplicate list memberships or automation entries.