> ## Documentation Index
> Fetch the complete documentation index at: https://docs.brew.new/llms.txt
> Use this file to discover all available pages before exploring further.

# ESP Integrations: Braze, Klaviyo, Mailchimp, and More

> Connect the ESP you already use. Export a Brew email as a reusable template to eleven providers, or send directly through Customer.io. No copy-paste either way.

<Note>
  **January 2026** · Available on all plans.
</Note>

## What Shipped

Keep your sending infrastructure where it is and use Brew for the
creative work. Connect the ESP you already run, and every Brew email can
go straight into it, as a reusable template you drop into your own
campaigns and flows, or, for Customer.io, delivered through your account
directly.

## Two Ways an Email Lands

**Export as a reusable template: eleven destinations.** From any email,
**Send → Export Template** renders the design to production HTML, applies
the preview text, rewrites Brew's unsubscribe placeholders to the
provider's own tag format, and creates a reusable template in your
account's library.

* **One-click OAuth:** Klaviyo (CODE template), Mailchimp, Brevo, HubSpot
* **API key:** Braze, Iterable, OneSignal, SendGrid (dynamic template),
  Postmark, Mailgun, Mailjet

**Send directly through your ESP: Customer.io.** Customer.io connects as
a delivery provider rather than a template target: you design in Brew and
**Send → through Customer.io**, and it delivers through your account. It
doesn't push a template. To reuse a design as a Customer.io template you
export the HTML and import it into Design Studio manually. See the
[Customer.io Page](/integrations/export/customerio) for that flow.

## How It Works

<Steps>
  <Step title="Connect the ESP">
    In **Integrations**, click the provider. Klaviyo, Mailchimp, Brevo,
    and HubSpot authorize over one-click OAuth. Brew never sees a
    password or API key. The rest take an API key or two from the
    provider's dashboard.
  </Step>

  <Step title="Open an Email and Choose How to Send">
    Open the email in Brew and click **Send** in the top right. Pick
    **Export Template** to push it into the provider's template library,
    or (Customer.io) send it through your connected account.
  </Step>

  <Step title="Review and Go">
    Name the template, review the subject and preview text, then export
    or send. You keep execution (campaigns, flows, journeys) in the
    platform you already trust.
  </Step>
</Steps>

## Get Started

[Connect an Integration](/integrations/integrations), then open any email
and pick **Send**.

## Related

* [All Integrations](/integrations/integrations)
* **Export a template:** [Klaviyo](/integrations/export/klaviyo) ·
  [Mailchimp](/integrations/export/mailchimp) ·
  [Brevo](/integrations/export/brevo) ·
  [HubSpot](/integrations/export/hubspot) ·
  [Braze](/integrations/export/braze) ·
  [Iterable](/integrations/export/iterable) ·
  [OneSignal](/integrations/export/onesignal) ·
  [SendGrid](/integrations/export/sendgrid) ·
  [Postmark](/integrations/export/postmark) ·
  [Mailgun](/integrations/export/mailgun) ·
  [Mailjet](/integrations/export/mailjet)
* **Send directly:** [Customer.io](/integrations/export/customerio)