# Resend The universal API for sending emails. - **Category:** email - **Auth:** API_KEY - **Composio Managed App Available?** N/A - **Tools:** 62 - **Triggers:** 0 - **Slug:** `RESEND` - **Version:** 20260410_00 ## Tools ### Add Contact To Segment **Slug:** `RESEND_ADD_CONTACT_TO_SEGMENT` Add an existing contact to a segment in Resend. Use when you need to organize contacts into specific segments for targeted communication. ### Cancel Email **Slug:** `RESEND_CANCEL_EMAIL` Cancel a scheduled email. ### Create API Key **Slug:** `RESEND_CREATE_API_KEY` Create a new API key to authenticate communications with Resend. Use when you need to generate a new authentication token for API access. ### Create Audience **Slug:** `RESEND_CREATE_AUDIENCE` Create a list of contacts. ### Create Contact **Slug:** `RESEND_CREATE_CONTACT` Create a contact in Resend. ### Create Contact Property **Slug:** `RESEND_CREATE_CONTACT_PROPERTY` Tool to create a new contact property in Resend. Use when you need to define custom fields for contacts. ### Create Contact V2 **Slug:** `RESEND_CREATE_CONTACT_V2` Tool to create a new contact in Resend. Use when you need to add a contact to Resend without specifying an audience. ### Create Domain **Slug:** `RESEND_CREATE_DOMAIN` Create a domain through the Resend Email API. The domain is created in a pending/unverified state and cannot be used for sending emails until DNS verification is completed. ### Create Template **Slug:** `RESEND_CREATE_TEMPLATE` Tool to create a new email template in Resend. Use when you need to define reusable email templates with optional variables. ### Create Topic **Slug:** `RESEND_CREATE_TOPIC` Tool to create a new topic to segment your audience. Use when you need to create a topic for organizing contacts by interests or preferences. ### Create Webhook **Slug:** `RESEND_CREATE_WEBHOOK` Tool to create a webhook to receive real-time notifications about email events. Use when you need to set up automated notifications for email status changes. ### Delete API Key **Slug:** `RESEND_DELETE_API_KEY` Remove an existing API key from Resend. Use when you need to revoke or delete an API key. ### Delete Audience **Slug:** `RESEND_DELETE_AUDIENCE` Remove an existing audience. ### Delete Contact **Slug:** `RESEND_DELETE_CONTACT` Delete a contact in Resend. ### Delete Contact By ID **Slug:** `RESEND_DELETE_CONTACT_BY_ID` Tool to remove an existing contact by its ID. Use when you need to delete a contact directly without specifying an audience. ### Delete Contact Property **Slug:** `RESEND_DELETE_CONTACT_PROPERTY` Remove an existing contact property from Resend. ### Delete Domain **Slug:** `RESEND_DELETE_DOMAIN` Delete a domain through the Resend Email API. Deletion is irreversible; ensure no active email traffic or DNS configurations depend on the domain before calling. ### Delete Segment **Slug:** `RESEND_DELETE_SEGMENT` Remove an existing segment. Use when you need to permanently delete a segment by its ID. ### Delete Template **Slug:** `RESEND_DELETE_TEMPLATE` Remove an existing template. Use this action when you need to delete a template from Resend. ### Delete Topic **Slug:** `RESEND_DELETE_TOPIC` Tool to remove an existing topic in Resend. Use when you need to delete a topic. ### Delete Webhook **Slug:** `RESEND_DELETE_WEBHOOK` Remove an existing webhook. Use this to delete a webhook configuration when you no longer need to receive event notifications at that endpoint. ### Duplicate Template **Slug:** `RESEND_DUPLICATE_TEMPLATE` Duplicate an existing template through the Resend Email API. Use when you need to create a copy of an existing template. ### Get Contact **Slug:** `RESEND_GET_CONTACT` Tool to retrieve a single contact from Resend by ID or email. Use when you need to get details of a specific contact using the global contacts endpoint. ### Get Contact Property **Slug:** `RESEND_GET_CONTACT_PROPERTY` Tool to retrieve a single contact property from Resend. Use when you need to get details about a specific contact property by its ID. ### Get Email Attachment **Slug:** `RESEND_GET_EMAIL_ATTACHMENT` Retrieve a single attachment from a sent email. Use when you need to access attachment metadata and download URL. ### Get Segment **Slug:** `RESEND_GET_SEGMENT` Retrieve a single segment by its ID. Use when you need to get detailed information about a specific segment. ### Get Template **Slug:** `RESEND_GET_TEMPLATE` Retrieve a single template by ID or alias from Resend. Use when you need to view template details. ### Get Topic **Slug:** `RESEND_GET_TOPIC` Tool to retrieve a single topic by its ID in Resend. Use when you need to fetch details of a specific topic. ### Get Webhook **Slug:** `RESEND_GET_WEBHOOK` Retrieve a single webhook for the authenticated user. Use this to get details about a specific webhook configuration including its endpoint, subscribed events, and signing secret. ### List All Contacts **Slug:** `RESEND_LIST_ALL_CONTACTS` Tool to retrieve a list of all contacts from Resend. Use when you need to fetch contacts across all audiences with optional pagination. ### List API Keys **Slug:** `RESEND_LIST_API_KEYS` Tool to retrieve a list of API keys for the authenticated user. Use when you need to view all API keys associated with the account, including pagination support for large result sets. ### List Audiences **Slug:** `RESEND_LIST_AUDIENCES` List all audiences. ### List Broadcasts **Slug:** `RESEND_LIST_BROADCASTS` Tool to retrieve a list of broadcasts. Use when you need to fetch all broadcasts or paginate through them. ### List Contact Properties **Slug:** `RESEND_LIST_CONTACT_PROPERTIES` Tool to retrieve a list of contact properties from Resend. Use when you need to view available contact property definitions. ### List Contacts **Slug:** `RESEND_LIST_CONTACTS` List contacts in Resend. ### List Contact Segments **Slug:** `RESEND_LIST_CONTACT_SEGMENTS` Retrieve a list of segments that a contact is part of. Use when you need to determine which segments a specific contact belongs to. ### List Contact Topics **Slug:** `RESEND_LIST_CONTACT_TOPICS` Retrieve a list of topic subscriptions for a contact in Resend. Use when you need to check which topics a specific contact is subscribed to. ### List Domains **Slug:** `RESEND_LIST_DOMAINS` List all domains. Use the returned domain IDs as inputs for tools like RESEND_VERIFY_DOMAIN that require a domain_id. ### List Email Attachments **Slug:** `RESEND_LIST_EMAIL_ATTACHMENTS` Tool to retrieve a list of attachments from a sent email. Use when you need to get information about files attached to an email sent via Resend. ### List Emails **Slug:** `RESEND_LIST_EMAILS` Tool to retrieve a list of emails sent by your team. Use when you need to fetch outbound emails from your account. Supports pagination with limit, after, and before parameters. ### List Received Emails **Slug:** `RESEND_LIST_RECEIVED_EMAILS` Tool to retrieve a list of received emails for the authenticated user. Use when you need to fetch incoming emails from the receiving endpoint. ### List Segments **Slug:** `RESEND_LIST_SEGMENTS` Tool to retrieve a list of segments from Resend. Use when you need to view all available segments for audience management. ### List Templates **Slug:** `RESEND_LIST_TEMPLATES` Tool to retrieve a list of templates from Resend. Use when you need to get all available templates with optional pagination support. ### List Topics **Slug:** `RESEND_LIST_TOPICS` Tool to retrieve a list of topics for the authenticated user. Use when you need to fetch available topics with optional pagination support. ### List Webhooks **Slug:** `RESEND_LIST_WEBHOOKS` Retrieve a list of webhooks for the authenticated user. Use this to view all configured webhooks with their endpoints, event types, and status. ### Publish Template **Slug:** `RESEND_PUBLISH_TEMPLATE` Publish a template through the Resend Email API. Use when you need to make a template publicly available. ### Remove Contact From Segment **Slug:** `RESEND_REMOVE_CONTACT_FROM_SEGMENT` Remove an existing contact from a segment. Use when you need to disassociate a contact from a specific segment. ### Retrieve Audience **Slug:** `RESEND_RETRIEVE_AUDIENCE` Retrieve a single audience. ### Retrieve Contact **Slug:** `RESEND_RETRIEVE_CONTACT` Retrieve a contact in Resend. ### Retrieve Domain **Slug:** `RESEND_RETRIEVE_DOMAIN` Retrieve a single domain. ### Retrieve Email **Slug:** `RESEND_RETRIEVE_EMAIL` Retrieve a single email. ### Send Batch Emails **Slug:** `RESEND_SEND_BATCH_EMAILS` Trigger up to 100 batch emails at once. Use when you need to send multiple emails in a single API request. ### Send Email **Slug:** `RESEND_SEND_EMAIL` Send an email using Resend. Confirm recipients and content with the user before invoking — sends are irreversible. All recipients must be listed explicitly via `to`, `cc`, or `bcc`; audience-based sending is unsupported. Render HTML or plain text externally before passing via `html` or `text`. ### Update Broadcast **Slug:** `RESEND_UPDATE_BROADCAST` Update an existing broadcast in Resend. Use when you need to modify broadcast details like name, subject, content, or recipients. ### Update Contact **Slug:** `RESEND_UPDATE_CONTACT` Tool to update an existing contact in Resend by ID or email. Use when you need to modify contact details such as name or subscription status. ### Update Contact Property **Slug:** `RESEND_UPDATE_CONTACT_PROPERTY` Update an existing contact property in Resend. Only the fallback_value can be updated; the key and type fields cannot be changed after creation. ### Update Domain **Slug:** `RESEND_UPDATE_DOMAIN` Update an existing domain. ### Update Email **Slug:** `RESEND_UPDATE_EMAIL` Update a scheduled email. ### Update Template **Slug:** `RESEND_UPDATE_TEMPLATE` Tool to update an existing email template in Resend. Use when you need to modify template properties such as name, subject, HTML content, or variables. ### Update Topic **Slug:** `RESEND_UPDATE_TOPIC` Tool to update an existing topic in Resend. Use when you need to modify the name of a topic. ### Update Webhook **Slug:** `RESEND_UPDATE_WEBHOOK` Tool to update an existing webhook configuration. Use when you need to modify the endpoint URL, change event subscriptions, or enable/disable a webhook. ### Verify Domain **Slug:** `RESEND_VERIFY_DOMAIN` Verify a domain through the Resend Email API. DNS records must fully propagate before verification succeeds; avoid immediate retries after DNS setup.