Resend Connector: Send Emails from Workflows

The Resend connector lets your workflows send transactional and marketing emails, manage audience contacts, and verify sending domains.

For the full API reference, see the Resend API documentation.

If you just need to send a quick notification email without setting up an external service, use the built-in Send Email node instead, as it sends from Spojit with no connection required.

Connection setup

Get your API key

Add the connection in Spojit

Go to Connections in Spojit, click Add Connection, select Resend, and enter:

API Key: Your Resend API key (starts with re_)
Default From Address (optional): A default sender address (e.g., Team <hello@yourdomain.com>) used when from is not specified in the tool parameters

Make sure you’ve verified a sending domain in Resend before sending emails. Emails from unverified domains will fail.

Tools

Emails

send-email: Send an email

string

Sender address. Falls back to the connection’s default from address.

string | string[]

required

Recipient email address(es).

string

required

Email subject line.

string

HTML email body.

string

Plain text email body.

string | string[]

CC recipient(s).

string | string[]

BCC recipient(s).

string | string[]

Reply-to address(es).

object[]

Email tags for tracking. Each tag has a name and value.

string

Schedule send time (ISO 8601).

object[]

File attachments. Each item is an object with a filename and base64-encoded content.In a workflow, map content to an upstream output that already produces base64-encoded bytes (e.g. a file downloaded over HTTP/FTP, or a document produced by another step).

Example request:

{
  "from": "Acme <onboarding@resend.dev>",
  "to": ["delivered@resend.dev"],
  "subject": "hello world",
  "html": "<p>it works!</p>",
  "reply_to": "onboarding@resend.dev",
  "attachments": [
    { "filename": "report.csv", "content": "Y29sMSxjb2wyCg==" }
  ]
}

Example response:

{
  "id": "49a3999c-0ce1-4ea6-ab68-afcd6dc2e794"
}

send-batch-emails: Send multiple emails

object[]

required

Array of email objects with the same fields as send-email (including attachments).

Example request:

{
  "emails": [
    {
      "from": "Acme <onboarding@resend.dev>",
      "to": ["foo@gmail.com"],
      "subject": "hello world",
      "html": "<h1>it works!</h1>"
    },
    {
      "from": "Acme <onboarding@resend.dev>",
      "to": ["bar@outlook.com"],
      "subject": "world hello",
      "html": "<p>it works!</p>"
    }
  ]
}

Example response:

{
  "data": [
    {
      "id": "ae2014de-c168-4c61-8267-70d2662a1ce1"
    },
    {
      "id": "faccb7a5-8a28-4e9a-ac64-8da1cc3bc1cb"
    }
  ]
}

get-email: Get sent email details

string

required

Email ID.

Example request:

{
  "id": "4ef9a417-02e9-4d39-ad75-9611e0fcc33c"
}

Example response:

{
  "object": "email",
  "id": "4ef9a417-02e9-4d39-ad75-9611e0fcc33c",
  "to": ["delivered@resend.dev"],
  "from": "Acme <onboarding@resend.dev>",
  "created_at": "2023-04-03T22:13:42.674981+00:00",
  "subject": "Hello World",
  "html": "Congrats on sending your <strong>first email</strong>!",
  "text": null,
  "bcc": [],
  "cc": [],
  "reply_to": [],
  "last_event": "delivered",
  "scheduled_at": null,
  "tags": [
    {
      "name": "category",
      "value": "confirm_email"
    }
  ]
}

list-emails: List all sent emails

No parameters required.Example response:

{
  "object": "list",
  "has_more": false,
  "data": [
    {
      "id": "4ef9a417-02e9-4d39-ad75-9611e0fcc33c",
      "to": ["delivered@resend.dev"],
      "from": "Acme <onboarding@resend.dev>",
      "created_at": "2023-04-03T22:13:42.674981+00:00",
      "subject": "Hello World",
      "bcc": null,
      "cc": null,
      "reply_to": null,
      "last_event": "delivered",
      "scheduled_at": null
    }
  ]
}

Contacts

create-contact: Add a contact to an audience

string

required

Audience ID.

string

required

Contact email address.

string

First name.

string

Last name.

boolean

default:"false"

Whether the contact is unsubscribed.

Example request:

{
  "audience_id": "78261eea-8f8b-4381-83c6-79fa7120f1cf",
  "email": "steve.wozniak@gmail.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
}

Example response:

{
  "object": "contact",
  "id": "479e3145-dd38-476b-932c-529ceb705947"
}

list-contacts: List contacts in an audience

string

required

Audience ID.

Example request:

{
  "audience_id": "78261eea-8f8b-4381-83c6-79fa7120f1cf"
}

Example response:

{
  "object": "list",
  "has_more": false,
  "data": [
    {
      "id": "e169aa45-1ecf-4183-9955-b1499d5701d3",
      "email": "steve.wozniak@gmail.com",
      "first_name": "Steve",
      "last_name": "Wozniak",
      "created_at": "2023-10-06T23:47:56.678Z",
      "unsubscribed": false
    }
  ]
}

get-contact: Get a contact by ID

string

required

Audience ID.

string

required

Contact ID.

Example request:

{
  "audience_id": "78261eea-8f8b-4381-83c6-79fa7120f1cf",
  "id": "e169aa45-1ecf-4183-9955-b1499d5701d3"
}

Example response:

{
  "object": "contact",
  "id": "e169aa45-1ecf-4183-9955-b1499d5701d3",
  "email": "steve.wozniak@gmail.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "created_at": "2023-10-06T23:47:56.678Z",
  "unsubscribed": false
}

update-contact: Update a contact

string

required

Audience ID.

string

required

Contact ID.

string

New first name.

string

New last name.

boolean

Update subscription status.

Example request:

{
  "audience_id": "78261eea-8f8b-4381-83c6-79fa7120f1cf",
  "id": "479e3145-dd38-476b-932c-529ceb705947",
  "unsubscribed": true
}

Example response:

{
  "object": "contact",
  "id": "479e3145-dd38-476b-932c-529ceb705947"
}

delete-contact: Remove a contact

string

required

Audience ID.

string

required

Contact ID.

Example request:

{
  "audience_id": "78261eea-8f8b-4381-83c6-79fa7120f1cf",
  "id": "520784e2-887d-4c25-b53c-4ad46ad38100"
}

Example response:

{
  "object": "contact",
  "contact": "520784e2-887d-4c25-b53c-4ad46ad38100",
  "deleted": true
}

Domains

list-domains: List configured domains

No parameters required.Example response:

{
  "object": "list",
  "has_more": false,
  "data": [
    {
      "id": "d91cd9bd-1176-453e-8fc1-35364d380206",
      "name": "example.com",
      "status": "not_started",
      "created_at": "2023-04-26T20:21:26.347412+00:00",
      "region": "us-east-1"
    }
  ]
}

get-domain: Get domain details

string

required

Domain ID.

Example request:

{
  "id": "d91cd9bd-1176-453e-8fc1-35364d380206"
}

Example response:

{
  "object": "domain",
  "id": "d91cd9bd-1176-453e-8fc1-35364d380206",
  "name": "example.com",
  "status": "not_started",
  "created_at": "2023-04-26T20:21:26.347412+00:00",
  "region": "us-east-1",
  "records": [
    {
      "record": "SPF",
      "name": "send",
      "type": "MX",
      "ttl": "Auto",
      "status": "not_started",
      "value": "feedback-smtp.us-east-1.amazonses.com",
      "priority": 10
    },
    {
      "record": "SPF",
      "name": "send",
      "value": "\"v=spf1 include:amazonses.com ~all\"",
      "type": "TXT",
      "ttl": "Auto",
      "status": "not_started"
    },
    {
      "record": "DKIM",
      "name": "resend._domainkey",
      "value": "p=MIGfMA0GCSqGSIb3DQEBAQUAA4...",
      "type": "TXT",
      "status": "not_started",
      "ttl": "Auto"
    }
  ]
}

verify-domain: Trigger DNS verification

string

required

Domain ID.

Example request:

{
  "id": "d91cd9bd-1176-453e-8fc1-35364d380206"
}

Example response:

{
  "object": "domain",
  "id": "d91cd9bd-1176-453e-8fc1-35364d380206"
}

Advanced

raw-request: Make an arbitrary HTTP request

Send a request to any Resend API endpoint.

string

required

HTTP method: GET, POST, PATCH, PUT, or DELETE.

string

required

API path (e.g., /emails).

object

Request body.

Example request:

{
  "method": "POST",
  "path": "/emails",
  "body": {
    "from": "Acme <onboarding@resend.dev>",
    "to": ["delivered@resend.dev"],
    "subject": "Hello World",
    "html": "<p>Congrats on sending your first email!</p>"
  }
}

Example response:

{
  "id": "49a3999c-0ce1-4ea6-ab68-afcd6dc2e794"
}

Overview

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Encoding and Validation

Developer Tools

Resend Connector: Send Emails from Workflows

Connection setup

Tools

Emails

Contacts

Domains

Advanced

​Connection setup

​Tools

​Emails

​Contacts

​Domains

​Advanced

Connection setup

Tools

Emails

Contacts

Domains

Advanced