Nylas Transactional send API

Nylas' Transactional Send endpoint lets you send messages directly from an email domain that you've verified with Nylas. You can use this to send password reset emails, account verifications, or system notifications.

Operations 1

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

POST /v3/domains/{domain_name}/messages/send Send a transactional email from my domain · Send a transactional email #
Ask an LLM
“How do I send a transactional email from my own verified domain?”
“Can I track bounces and complaints on transactional emails?”
Tell an agent
Send a transactional email from {from} on {domain_name} to {to}.
Schedule a {domain_name} email from {from} to {to} for {send_at}.

Documentation

Specifications

Schemas & Data

Other Resources

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/nylas:nylas-transactional-send-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

nylas-transactional-send-api-openapi.yml Raw ↑
openapi: 3.2.0
info:
  title: Nylas Transactional send API
  version: v3
  summary: The complete Nylas v3 API — Email, Calendar, Contacts, Notetaker, Scheduling, Administration, and Migration.
  description: The Nylas API is designed using the REST ideology to provide simple and predictable URIs to access and modify objects. Requests support standard HTTP methods like `GET`, `PUT`, `POST`, and `DELETE`, and standard status codes. Response bodies are always UTF-8 encoded JSON objects, unless explicitly documented otherwise. You can use the Nylas Postman collection to quickly start using the Nylas APIs. For more information, check out the Nylas Postman collection documentation.
  contact:
    url: https://www.nylas.com/
servers:
- url: https://api.us.nylas.com
  description: U.S.
- url: https://api.eu.nylas.com
  description: E.U.
security:
- ACCESS_TOKEN: []
- NYLAS_API_KEY: []
tags:


# --- truncated at 32 KB (37 KB total) ---
# Full source: https://artifacts.apis.io/nylas/openapi/nylas-transactional-send-api-openapi.yml