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POST
https://api.resend.com
/
emails
/
batch
import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

const { data, error } = await resend.batch.send([
  {
    from: 'Acme <[email protected]>',
    to: ['[email protected]'],
    subject: 'hello world',
    html: '<h1>it works!</h1>',
  },
  {
    from: 'Acme <[email protected]>',
    to: ['[email protected]'],
    subject: 'world hello',
    html: '<p>it works!</p>',
  },
]);

{
  "data": [
    {
      "id": "ae2014de-c168-4c61-8267-70d2662a1ce1"
    },
    {
      "id": "faccb7a5-8a28-4e9a-ac64-8da1cc3bc1cb"
    }
  ],
  // the `errors` array is only present in permissive batch validation mode
  "errors": [
    {
      "index": 2, // 0-indexed (first item is index 0)
      "message": "The `to` field is missing."
    }
  ]
}
Instead of sending one email per HTTP request, we provide a batching endpoint that permits you to send up to 100 emails in a single API call.

​
Body Parameters

​
from
string
required
Sender email address.To include a friendly name, use the format "Your Name <[email protected]>".
​
to
string | string[]
required
Recipient email address. For multiple addresses, send as an array of strings. Max 50.
​
subject
string
required
Email subject.
​
bcc
string | string[]
Bcc recipient email address. For multiple addresses, send as an array of strings.
​
cc
string | string[]
Cc recipient email address. For multiple addresses, send as an array of strings.
​
html
string
The HTML version of the message.
​
text
string
The plain text version of the message.
If not provided, the HTML will be used to generate a plain text version. You can opt out of this behavior by setting value to an empty string.
​
react
React.ReactNode
The React component used to write the message. Only available in the Node.js SDK.
​
headers
object
Custom headers to add to the email.
​
tags
array
Custom data passed in key/value pairs.See examples.
​
template
object
To send using a template, provide a template object with:
  • id: the id or the alias of the published template
  • variables: array of variable objects (if applicable)
If a template is provided, you cannot send html, text, or react in the payload, otherwise the API will return a validation error.When sending a template, the payload for from, subject, and reply_to take precedence over the template’s defaults for these fields. If the template does not provide a default value for these fields, you must provide them in the payload.
​
id
string
required
The id of the published email template. Required if template is provided. Only published templates can be used when sending emails.
​
variables
object
Template variables object with key/value pairs.
variables: {
	CTA: 'Sign up now',
	CTA_LINK: 'https://example.com/signup'
}
When sending the template, the HTML will be parsed. If all the variables used in the template were provided, the email will be sent. If not, the call will throw a validation error.See the errors reference for more details or learn more about templates.

​
Headers

​
Idempotency-Key
string
Add an idempotency key to prevent duplicated emails.
  • Should be unique per API request
  • Idempotency keys expire after 24 hours
  • Have a maximum length of 256 characters
Learn more about idempotency keys →
​
x-batch-validation
strict | permissive
default:"strict"
Batch validation modes control how emails are validated in batch sending.Choose between two modes:
  • Strict mode (default): sends the batch only if all emails in the request are valid.
  • Permissive mode: processes all emails, allowing for partial success and returning validation errors if present.
Learn more about batch validation →

​
Limitations

The attachments and scheduled_at fields are not supported yet. 
import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

const { data, error } = await resend.batch.send([
  {
    from: 'Acme <[email protected]>',
    to: ['[email protected]'],
    subject: 'hello world',
    html: '<h1>it works!</h1>',
  },
  {
    from: 'Acme <[email protected]>',
    to: ['[email protected]'],
    subject: 'world hello',
    html: '<p>it works!</p>',
  },
]);

{
  "data": [
    {
      "id": "ae2014de-c168-4c61-8267-70d2662a1ce1"
    },
    {
      "id": "faccb7a5-8a28-4e9a-ac64-8da1cc3bc1cb"
    }
  ],
  // the `errors` array is only present in permissive batch validation mode
  "errors": [
    {
      "index": 2, // 0-indexed (first item is index 0)
      "message": "The `to` field is missing."
    }
  ]
}