Resend Email Service

Resend sends email using an API key. Once configured, users can receive sign-up verification, password reset, and email verification code messages in their own inboxes.

Enable email sending in production

Create a Resend API Key

Create an account at resend.com
Open the API Keys page
Click Create API Key
Select Sending access
Copy the API Key immediately after creating it

The key starts with re_ and is only displayed once, so store it safely.

Verify your sender domain

Open Domains in Resend
Click Add Domain and enter your sender domain
Add the DNS records shown by Resend to your DNS provider
Return to Resend and click Verify DNS Records
Wait until the domain is verified

Once verified, you can send from an address such as noreply@yourdomain.com.

Add the production configuration

Add RESEND_API_KEY to apps/server/.env.production:

apps/server/.env.production

RESEND_API_KEY=re_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Then select Resend in packages/app-config/src/app-config.ts and enter the verified domain:

packages/app-config/src/app-config.ts

email: {
  provider: "resend",
  from: {
    localPart: "noreply",
    domain: "yourdomain.com",
  },
},

Deploy and receive a test email

Push the production secrets and deploy the server normally. After deployment, use a real address to trigger sign-up verification, forgot password, or an email verification code.

Receiving the message confirms that production sending is active. If it does not appear immediately, check the spam folder and Resend Logs.

Receive real email during local development

Add the same RESEND_API_KEY to apps/server/.dev.vars:

apps/server/.dev.vars

RESEND_API_KEY=re_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Make sure the email provider is set to resend, restart the local server, and trigger sign-up verification, forgot password, or an email verification code. The message will be delivered directly to the test address you entered.

During initial testing, Resend allows you to send to the email address registered with your Resend account. Verify your sender domain before sending to other users. If the message does not arrive, check the spam folder and Resend Logs.