Overview
What Resend is
Resend is a developer-first email API for sending transactional and marketing email, built by the team behind React Email.
Courier sits in front of it as one API, a visual editor, journeys, and every other channel, so you keep Resend for delivery and build multi-channel notifications on top.
You need a Courier account and your own Resend account and API key.
Why Courier
What you get with Resend + Courier
Design beautiful emails, no code
Build and edit email in Courier's visual editor. Product and marketing change content and layout without shipping code, and every send still goes out through Resend.
Automate multi-step journeys
Onboarding, drip, and lifecycle sequences with delays and branching, all delivered through Resend.
Add SMS, push, and chat
The same notification can reach every channel. Add one when you need it, with no new integration in your code.
Add an in-app inbox
A new, easy add-on: drop Courier Inbox into your web or mobile app so users get an in-product notification center alongside email.
Localize a template in seconds
Pick a language and let Courier translate the whole template with AI, then tweak any string. One template, every market.
Send to lists and audiences
Broadcast a one-off or recurring message to an entire list through Resend, alongside your transactional email.
Use cases
What teams build with it
Setup
Connect it in minutes
An admin adds Resend once on the Integrations page in Courier. Once connected, anyone on your team can design and send email through Resend, and add channels whenever they need them.
FAQ
Frequently asked questions
Can I use Resend with Courier?
Yes. Resend is a supported email provider in Courier. You configure it once, then send through Resend using Courier's Send API, while Courier adds template design, Journeys, and other channels like SMS and push.
Do I still need my own Resend account?
Yes. You bring your own Resend account and API key; Courier does not resell Resend. Resend stays your email delivery service, and Courier routes messages through it rather than replacing it.
What do I need to connect Resend to Courier?
A Resend API key and a From Address. You paste the key into Courier's Resend integration page and set a From Address such as noreply@yourdomain.com that Resend will send from.
How do I set up the Resend integration in Courier?
Create an API key in Resend's API Keys section, paste it into Courier's Resend integration page, add your From Address, then click Add Integration and Save. After that, Courier can send email through Resend.
Does my sender and recipient email need to be verified or set?
Yes. The From Address must be a sender you have verified in Resend. On the recipient side, Courier needs each user's email stored as email on their profile before it can deliver through Resend.
Can I override the Resend request or send attachments?
Yes. Provider overrides let you set parameters on Resend's /emails endpoint, override config values like apiKey and fromAddress, and include attachments as base64-encoded file content.
Is Courier a replacement for Resend?
No. Courier sits in front of Resend, and Resend still delivers the email. Courier adds the Send API, Journeys, and Design Studio, plus other channels like SMS, push, and Courier Inbox.
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