---
title: "Changelog"
description: "Product updates and announcements from Unsend"
---

<Update label="March 2026" description="v1.9.0">

### Campaign Personalization with Contact Books

Campaigns now support contact-book variables for personalization, so you can tailor each message with richer subscriber data.

### Double Opt-In Customization

Double opt-in now supports customizable confirmation flows and copy, making it easier to match your onboarding experience and compliance requirements.

### API and SDK Coverage

Contact book support has been expanded in the SDK, dashboard analytics is now available in both the public API and SDK, and a public endpoint to delete campaigns has been added.

### Webhook Filtering by Domain

Webhooks now support multi-domain filtering, making it easier to route, monitor, and manage events across different projects.

</Update>

<Update label="February 2025" description="v1.8.0">

<Frame>
  <img src="/images/changelog/webhook.png" alt="Schedule Campaigns" />
</Frame>

### Webhooks

You can now receive real-time notifications for email events via webhooks. Configure webhook endpoints to track deliveries, bounces, complaints, and more. [Learn more](https://docs.usesend.com/guides/webhooks)

### Contact Books API

Manage your contact books programmatically with the new public API. Create, update, and organize contacts at scale.

### Idempotency Support

API requests now support idempotency keys, ensuring safe retries without duplicate sends.

### Other improvements

- Export contact books to CSV for offline use.
- Security fixes for CVE-2025-55184 and CVE-2025-55183.
- Various bug fixes and performance improvements.

</Update>

<Update label="October 2024" description="v1.7.0">

<Frame>
  <img src="/images/changelog/schedule-campaign.png" alt="Schedule Campaigns" />
</Frame>

### Schedule Campaigns

You can now Schedule campaigns with natural language like "tomorrow at 9am" or "next Monday at 10am".

### Campaigns API

We're doubling down on APIs. Now you can create, schedule campaign emails from API. check [API documentation](/api-reference/introduction)

### Other improvements

- Camapign Emails are now sent in batches instead of a burst of emails.
- You can bulk upload large amounts of contacts without ui slowness.
- Added delete domain API.

</Update>

<Update label="September 2024" description="v1.6.0">
<Frame>
    <img src="https://usesend.com/hero-dark.webp" alt="Rebranded useSend hero" />
</Frame>

### Suppression List

Hard bounce and complained email addresses are automatically added to the suppression list. Works for both transactional and marketing emails.

### Rebranding to useSend

From now on we [useSend](https://usesend.com). Make sure to update your docker image and sdks.

</Update>
