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resend

Office & productivity

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Updated 10-16 09:47

About this skill

Troubleshooting

If requests fail, run zero doctor check-connector --env-name RESEND_TOKEN or zero doctor check-connector --url https://api.resend.com/emails --method POST

Emails

Send Email

Write to /tmp/resend_request.json:

{
  "from": "Acme <onboarding@resend.dev>",
  "to": ["<your-recipient-email>"],
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>"
}

Then run:

curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Send Email with Plain Text

Write to /tmp/resend_request.json:

{
  "from": "Acme <onboarding@resend.dev>",
  "to": ["<your-recipient-email>"],
  "subject": "<your-subject>",
  "text": "<your-plain-text-content>"
}

Then run:

curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Send Email with CC/BCC

Write to /tmp/resend_request.json:

{
  "from": "Acme <onboarding@resend.dev>",
  "to": ["<your-recipient-email>"],
  "cc": ["<your-cc-email>"],
  "bcc": ["<your-bcc-email>"],
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>"
}

Then run:

curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Send Email with Reply-To

Write to /tmp/resend_request.json:

{
  "from": "Acme <onboarding@resend.dev>",
  "to": ["<your-recipient-email>"],
  "reply_to": "<your-reply-to-email>",
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>"
}

Then run:

curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Send Scheduled Email

Schedule email using natural language or ISO 8601 format:

Write to /tmp/resend_request.json:

{
  "from": "Acme <onboarding@resend.dev>",
  "to": ["<your-recipient-email>"],
  "subject": "<your-subject>",
  "html": "<p><your-html-content></p>",
  "scheduled_at": "in 1 hour"
}

Then run:

curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Send Batch Emails

Send up to 100 emails in a single request:

Write to /tmp/resend_request.json:

[
  {
    "from": "Acme <onboarding@resend.dev>",
    "to": ["<your-recipient-1>"],
    "subject": "Hello 1",
    "html": "<p>Email 1</p>"
  },
  {
    "from": "Acme <onboarding@resend.dev>",
    "to": ["<your-recipient-2>"],
    "subject": "Hello 2",
    "html": "<p>Email 2</p>"
  }
]

Then run:

curl -s -X POST "https://api.resend.com/emails/batch" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Retrieve Email

curl -s "https://api.resend.com/emails/<your-email-id>" --header "Authorization: Bearer $RESEND_TOKEN"

List Sent Emails

curl -s "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_TOKEN"

Cancel Scheduled Email

curl -s -X POST "https://api.resend.com/emails/<your-email-id>/cancel" --header "Authorization: Bearer $RESEND_TOKEN"

Contacts

Create Contact

Write to /tmp/resend_request.json:

{
  "email": "<your-contact-email>",
  "first_name": "<your-first-name>",
  "last_name": "<your-last-name>",
  "unsubscribed": false
}

Then run:

curl -s -X POST "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Create Contact with Custom Properties

Write to /tmp/resend_request.json:

{
  "email": "<your-contact-email>",
  "first_name": "<your-first-name>",
  "last_name": "<your-last-name>",
  "properties": {
    "company": "<your-company-name>",
    "role": "<your-role>"
  }
}

Then run:

curl -s -X POST "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Retrieve Contact

curl -s "https://api.resend.com/contacts/<your-contact-id>" --header "Authorization: Bearer $RESEND_TOKEN"

List Contacts

curl -s "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_TOKEN"

List Contacts with Pagination

curl -s "https://api.resend.com/contacts?limit=50" --header "Authorization: Bearer $RESEND_TOKEN"

Update Contact

Write to /tmp/resend_request.json:

{
  "first_name": "<your-new-first-name>",
  "unsubscribed": true
}

Then run:

curl -s -X PATCH "https://api.resend.com/contacts/<your-contact-id>" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Delete Contact

curl -s -X DELETE "https://api.resend.com/contacts/<your-contact-id>" --header "Authorization: Bearer $RESEND_TOKEN"

Domains

List Domains

curl -s "https://api.resend.com/domains" --header "Authorization: Bearer $RESEND_TOKEN"

Retrieve Domain

curl -s "https://api.resend.com/domains/<your-domain-id>" --header "Authorization: Bearer $RESEND_TOKEN"

Create Domain

Write to /tmp/resend_request.json:

{
  "name": "<your-domain-name>"
}

Then run:

curl -s -X POST "https://api.resend.com/domains" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Verify Domain

curl -s -X POST "https://api.resend.com/domains/<your-domain-id>/verify" --header "Authorization: Bearer $RESEND_TOKEN"

Delete Domain

curl -s -X DELETE "https://api.resend.com/domains/<your-domain-id>" --header "Authorization: Bearer $RESEND_TOKEN"

API Keys

List API Keys

curl -s "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_TOKEN"

Create API Key

Write to /tmp/resend_request.json:

{
  "name": "<your-key-name>"
}

Then run:

curl -s -X POST "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Create API Key with Permissions

Write to /tmp/resend_request.json:

{
  "name": "<your-key-name>",
  "permission": "sending_access"
}

Then run:

curl -s -X POST "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_TOKEN" --header "Content-Type: application/json" -d @/tmp/resend_request.json

Delete API Key

curl -s -X DELETE "https://api.resend.com/api-keys/<your-api-key-id>" --header "Authorization: Bearer $RESEND_TOKEN"

Email Parameters Reference

Parameter Type Description
from string Sender email (required). Format: "Name <email@domain.com>"
to string[] Recipients (required). Max 50 addresses
subject string Email subject (required)
html string HTML content
text string Plain text content
cc string[] CC recipients
bcc string[] BCC recipients
reply_to string Reply-to address
scheduled_at string Schedule time (ISO 8601 or natural language)
tags array Custom tags for tracking
attachments array File attachments (max 40MB total)

Response Codes

Status Description
200 Success
400 Invalid parameters
401 Missing API key
403 Invalid API key
404 Resource not found
429 Rate limit exceeded (2 req/sec)
5xx Server error

Guidelines

  1. Rate Limits: Default is 2 requests per second; implement backoff for 429 errors
  2. Sender Domain: Use verified domains for production; onboarding@resend.dev for testing
  3. Batch Emails: Use /emails/batch for sending to multiple recipients efficiently
  4. Idempotency: Use Idempotency-Key header to prevent duplicate sends
  5. Scheduling: Use natural language (in 1 hour) or ISO 8601 format for scheduled_at

API Reference