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Use casesEmails

Emails, always on-brand

Your agent writes the copy and builds a responsive HTML layout from a Brief's guidance and assets. Preview the result, then adapt it for your email platform.

Zalando · Email
The Zalando email headed What do I wear?, with bold black-and-white type and a street-style photo of a person carrying an orange shoulder bag
HTML · 600 PX · TABLES

(01) Why use Rainbrand

Agents can write and code an email, but without the brand they guess at its voice, type and imagery. Rainbrand gives your agent a Brief for each email, with the guidance and assets for its copy, layout and images.

How it's made

From a Brief to a finished email.

Rainbrand · create_briefReady
Brand
Zalando
Task
A campaign email for Inner Voices, Autumn/Winter 2026
Returns
Guidance and selected assets
1 Brief

Plan the email from a Brief for the campaign.

Rows from the email600 px
Tables and inline stylesArial fallback
2 Build

Build it as HTML made for email.

Before you send5 checks
  • Brand fit against the Brief
  • Claims, links and placeholders
  • Your audience's email clients
  • Mobile layout
  • Blocked images and fallback fonts
3 Check

Test it in the inboxes your audience uses.

With your agent

Ask your agent for the email.

Describe the campaign, who it's for and where the main button goes. Your agent requests a Brief, builds and previews the HTML and checks it against the Brief.

Read the guide (opens in a new tab)

Works with your favourite agents

Codex
Rainbrand connected
You

Build a campaign email for zalando.com on the Inner Voices campaign for Autumn/Winter 2026, with Explore Zalando as the main action. Leave placeholders for sender details and subscription links, and don't send anything.

Codexcreate_briefInner Voices email

Codexget_briefWaiting until it's ready

Rainbrand Brief

Ready
Type and layoutBold black-and-white type, generous space and orange accents.
ImageryStreet-style photography.
LogosThe original wordmark and orange brand mark.

The Brief is ready. I'll turn Inner Voices into one everyday question, What do I wear?, with bold black-and-white type, orange accents and an original street-style image.

The HTML uses a 600px table layout, inline styles and Zalando Sans with Arial and Helvetica fallbacks. I checked the desktop and mobile previews against the Brief. Sender details and subscription links are placeholders, and it still needs testing in your email clients.

Illustrated with the Zalando email from the email guide, built as responsive HTML from a Brief.

Teams building with Rainbrand.

How companies integrate Rainbrand into their agents and products.

Revnu: REST API Letter: REST API The GTM Co-Founder: MCP

Revnu

“We use Rainbrand to fetch each customer’s brand and generate accurate, on-brand creative for their ads. It means we don’t have to reinvent that part of the stack ourselves.”

George JeffersonCo-founder, Revnu
Read the story: Revnu puts a brand layer inside its AI growth product
Letter

“We pushed Rainbrand to production as the brand layer behind every landing page, blog post, and publication our agents create.”

Mathew PregasenFounder and CEO, The Letter Company
Read the story: Letter builds Rainbrand into Letterpress
The GTM Co-Founder

“I have the ideas, but turning them into great design was always a struggle. Rainbrand makes me feel like the best designer in the world, and I don’t think I’ll need to hire one for the small stuff again.”

Shane O’ConnorFounder, The GTM Co-Founder
Read the story: The GTM Co-Founder uses one agent across several brands

Build your first campaign email.

Connect Rainbrand to your agent, add a brand and describe the campaign.

  1. Open the Rainbrand plugin and add it.

    Open Rainbrand plugin (opens in a new tab)
  2. Connect your Rainbrand account when asked. It works in ChatGPT and in Codex.

Email FAQ

Asked,
answered.

All FAQs

What do I need to build a campaign email?

A development environment connected to Rainbrand through MCP, a ready brand or sources such as a website to create one, and a campaign goal, audience and destination for the main call to action. Connect Rainbrand to your agent.

What does the Brief add to the email?

The Brief covers voice, campaign, typography, layout and imagery guidance and selects the brand's assets. For new images, use its guidance and references with your own image tool, or pass its ID to a supported image model through the AI Gateway. How Briefs work.

Does it work with my email platform?

Your agent creates responsive HTML. If your email platform supports custom HTML, adapt and import it there. Replace placeholders for subscription links and sender details, then test through that platform before sending.

Will it look right in every inbox?

The HTML uses a 600px table layout, inline styles and font fallbacks. The Zalando email loads Zalando Sans and falls back to Arial and Helvetica in clients that don't load it. A browser preview can't show how every inbox renders an email, so send tests to the clients your audience uses. Open the Zalando email.

What should I check before sending?

Compare the preview with the Brief, replace the browser-view, preferences, unsubscribe and company-address placeholders, and check the campaign claims and links. Then send test emails through your platform and check the mobile layout, blocked images and fallback fonts. To check a screenshot against the brand, request a Review.