Nylas Email API – Seamless Email Integration for Developers
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2025 Report: The Future of Meeting Recordings for Product Roadmaps

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Integrate any email provider with one Email API

The Nylas Email API connects your app with 100% of email service providers. Deliver integrations 12x faster than building on your own with near-perfect deliverability.

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IMAP
Introducing the Nylas Email API

Drive engagement with advanced email API features for contextual messaging

Nylas’ email API works with your users’ favorite services like Gmail, Outlook, and IMAP. It allows for two-way email conversations.

Attachments Bounce Detection Drafts Folders Messages Read, click and reply tracking Scheduled Send Search Send status Smart Compose Threads
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Connect to every provider

Connect to 100% of email service providers in minutes with our universal API. No custom code required.

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Unmatched deliverability

Send directly from your users’ inboxes vs proxy sends, with Nylas’ industry-leading 99.6% deliverability.

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Save thousands of dev hours

Give your developers and integration experts time back to refocus on advancing your roadmap. 

Customers

The email API powering top-tier applications

250,000+ developers trust Nylas to power email experiences their customers love.

Salesloft

Salesloft partners with Nylas to unlock new enterprise market

“We have millions of emails sent each week. Nylas frees us up to focus on delivering new features to our customers and working with our data science team on exciting new projects.”

Nora Ignatius

Nora Ignatius

Product Manager @ Salesloft

10+

full-time engineers retasked to other work

25%

of maintenance team resources conserved

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Funnel launches productivity-enhancing communications features using Nylas

“Nylas accelerated our timelines for moving forward because they provided a clear solution to meet our challenges. We were able to springboard out of the vision stage and dive into the execution sprint.”

Ben Rubin,

Ben Rubin,

CPO @ Funnel

150%

YoY increase in annual revenue

2

developers launched the solution in just three months

Read the full story

Jobylon expands global customer base with premium email and calendar features

“Nylas can do the heavy lifting of integrating with proprietary APIs, allowing us to work with a simple, standardized API.”

Niklas A. Emanuelsson,

Niklas A. Emanuelsson,

Head of Engineering @ Jobylon

25%

increase in annual recurring revenue

30%

increase in expansion and upsells

Read the full story

Crunchbase increases sales productivity and bookings with Nylas

“Adding bi-directional email sync provides our users with a way to increase their productivity within the Crunchbase platform [while encouraging upsells to a new pricing tier with premium features].

Monika Abraham,

Monika Abraham,

Product Ops Manager @ Crunchbase

1 new

pricing tier added to increase revenue

$75k

saved from Google security review

Read the full story
For developers

Sync emails in minutes

With a few lines of code, build email CRUD capabilities and bi-directional sync.

See the docs

Node.js

Ruby

Python

Java

Curl

const messages = await nylas.messages.list({
  identifier,
  queryParams: {
    limit: 5,
  }
})
require 'nylas'

nylas = Nylas::Client.new(api_key: 'API_KEY')
query_params = { limit: 5 }
messages, _ = nylas.messages.list(identifier: '<GRANT_ID>', query_params: query_params)

messages.each {|message|
    puts "[#{Time.at(message[:date]).strftime("%d/%m/%Y at %H:%M:%S")}] \
           #{message[:subject]}"
}  
messages = nylas.messages.list(
  grant_id,
  query_params={
    "limit": 5
  }
)
import com.nylas.NylasClient;
import com.nylas.models.*;
import java.text.SimpleDateFormat;

public class ReadInbox {
    public static void main(String[] args) throws NylasSdkTimeoutError, NylasApiError {
        NylasClient nylas = new NylasClient.Builder("<API_KEY>").build();
        ListMessagesQueryParams queryParams = new 
        ListMessagesQueryParams.Builder().limit(5).build();
        ListResponse<Message> message = nylas.messages().list("<GRANT_ID>", queryParams);

        for(Message email : message.getData()) {
            String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").
                format(new java.util.Date((email.getDate() * 1000L)));

            System.out.println("[" + date + "] | " + email.getSubject());
        }
    }
} 
curl --request GET \
  --url "https://api.us.nylas.com/v3/grants/GRANT_ID/messages?limit=5" \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer <API_KEY_OR_ACCESS_TOKEN>' \
  --header 'Content-Type: application/json'

Node.js

Ruby

Python

Java

Curl

const contact = new Contact(nylas);
// The following attributes can be modified for the contact object
contact.givenName = 'Nyla'
contact.birthday = '2014-06-01'
contact.companyName = 'Nylas'
contact.jobTitle = 'Communications Platform'
contact.officeLocation = 'San Francisco'
contact.notes = 'Check out the Nylas Email, Calendar, and Contacts APIs'
contact.emailAddresses = [new EmailAddress({
  type: 'work', email: 'nyla@nylas.com'
})];
contact.save();
contact = nylas.contacts.create
contact.given_name = 'Nyla'
contact.office_location = 'San Francisco'
contact.company_name = 'Nylas'
contact.notes =
  'Check out the Nylas Email, Calendar, and Contacts APIs'
contact.manager_name = 'Communications'
contact.job_title = 'Communications Platform'
contact.birthday = '2014-06-01'
contact.emails = [
{
  type: 'work',
  email: 'nyla@nylas.com'
}]
contact.save
contact = nylas.contacts.create()
contact.given_name = 'Nyla'
contact.office_location = 'San Francisco'
contact.company_name = 'Nylas'
contact.notes = 'Check out the Nylas Email, Calendar, and Contacts APIs'
contact.manager_name = 'Communications'
contact.job_title = 'Communications Platform'
contact.birthday = datetime(2014, 6, 1)
contact.emails['work'] = ['nyla@nylas.com']
contact.save()
public class NylasExamples {
    public static void createContact() throws IOException, RequestFailedException {
        Contact contact = new Contact();
        
        contact.setGivenName("Nyla");
        contact.setNickname("Nylas");
        contact.setOfficeLocation("San Francisco");
        contact.setCompanyName("Nylas");
        contact.setNotes("Check out the Nylas Email, Calendar, and Contacts APIs");
        contact.setManagerName("Communications");
        contact.setJobTitle("Communications Platform");
        contact.setBirthday("2014-06-01");
        
        contact.setEmails(Arrays.asList(new Contact.Email("work", "nyla@nylas.com")));
        contact = account.contacts().create(contact);
    }
}
curl --request POST \
  --url https://api.nylas.com/contacts \
  --data '{
  "birthday": "2014-06-01",
  "company_name": "Nylas",
  "emails": [
    {
      "email": "nyla@nylas.com",
      "type": "work"
    }
  ],
  "given_name": "Nyla",
  ],
  "job_title": "Nylas Mascot",
  "phone_numbers": [
    {
      "number": "1 800 GO NYLAS",
      "type": "business"
    }
  ],
  "web_pages": [
    {
      "type": "work",
      "url": "nylas.com"
    }
  ],
}'
View on Github

Response

{
    "request_id": "d0c951b9-61db-4daa-ab19-cd44afeeabac",
    "data": [
        {
            "starred": false,
            "unread": true,
            "folders": [
                "UNREAD",
                "CATEGORY_PERSONAL",
                "INBOX"
            ],
            "grant_id": "1",
            "date": 1706811644,
            "attachments": [
                {
                    "id": "1",
                    "grant_id": "1",
                    "filename": "invite.ics",
                    "size": 2504,
                    "content_type": "text/calendar; charset=\"UTF-8\"; method=REQUEST"
                },
                {
                    "id": "2",
                    "grant_id": "1",
                    "filename": "invite.ics",
                    "size": 2504,
                    "content_type": "application/ics; name=\"invite.ics\"",
                    "is_inline": false,
                    "content_disposition": "attachment; filename=\"invite.ics\""
                }
            ],
            "from": [
                {
                    "name": "Nylas DevRel",
                    "email": "nylasdev@nylas.com"
                }
            ],
            "id": "1",
            "object": "message",
            "snippet": "Send Email with Nylas APIs",
            "subject": "Learn how to Send Email with Nylas APIs",
            "thread_id": "1",
            "to": [
                {
                    "name": "Nyla",
                    "email": "nyla@nylas.com"
                }
            ],
            "created_at": 1706811644,
            "body": "Learn how to send emails using the Nylas APIs!"
        }
    ],
    "next_cursor": "123"
}
{
    "type": "event.created3",
    "data": {
      "object": {
        "busy": true,
        "calendar_id": "mock-name%40nylas.com",
        "created_at": 1234567890,
        "description": "mock description",
        "hide_participants": false,
        "ical_uid": "mock_uids@google.com",
        "id": "mock-data-id",
        "object": "event",
        "owner": "Mock Owner <mock_owner@example.com>",
        "organizer": {
          "name": "mock organizer name",
          "email": "mock_email@example.com"
        },
        "participants": [
          {
            "email": "mockParticipantsA@example.com",
            "name": "mockParticipantsA",
            "status": "yes"
          },
          {
            "email": "mockParticipantsB@example.comm",
            "name": "mockParticipantsB",
            "status": "noreply"
          }
        ],
        "read_only": false,
        "reminders": null,
        "status": "confirmed",
        "title": "mock_title",
        "updated_at": 1234567890,
        "when": {
          "start_time": 1234567890,
          "start_timezone": "America/Edmonton",
          "end_time": 1234567890,
          "end_timezone": "America/Edmonton",
          "object": "timespan"
        }
      }
    }
  }

Webhooks

Receive real-time notifications to monitor events and trigger automated workflows.

Sandbox environment

Experiment with our API with pre-configured settings in the Nylas Dashboard.

SDKs

Fast-track your integration with our Node.js, Ruby, Python, Java and Kotlin SDKs.

Everything you need for Email and Calendar

Sandbox

Test all Nylas functionality for free.
FREE

5 connected accounts

Get Started

Calendar Only

Just the calendar. No extra baggage.
$1/ca/month

Starts at $10/month for 5 accounts, then listed rate applies.

Get started

Full Platform

Everything you need to build your comm stack.
$1.50/ca/month

Starts at $15/month for 5 accounts, then listed rate applies.

Get started

Custom

Get everything you need. Start scaling.
Let’s Talk!

Volume pricing discounts

Contact sales

Learn more on our pricing page.

Demo

Watch our email API in action

Try an interactive demo to see how the Email API simplifies adding email features to your product. Follow green prompts to view API calls for actions like reading, replying, and sending emails.

Features

Simplify integrations with intelligent email API services

Leverage advanced email capabilities that save users time and automate tedious, manual workflows. 

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Message analytics

Track and show email status, including opens, clicks, replies, and bounces, for users to deliver more effective outreach.

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Smart Compose

Use our generative AI-powered email composer to create and edit messages, improving efficiency and eliminating writer’s block.

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Intelligent endpoints

Extract email signatures to keep user contact books up to date, create chat-like views of email threads, and access message metadata for trend analysis.

Use cases

Transform your app into a communication hub with Nylas Email API

Nylas makes it easy to build best-in-class email experiences in your application.

Contextual email

Power personal, relationship-building conversations in your app.

Explore contextual email

Automated outreach

Quickly build high-volume email outreach with near-perfect deliverability.

Explore automated outreach

Start for free with Nylas Email API

Discover the power of the Nylas platform and connect up to five accounts for free.

Build for free
Contact Sales

Frequently Asked Questions

What is the Nylas Email API and what can I build with it?

The Nylas Email API lets you send, receive, read, and manage emails from your application using your users’ existing inboxes. With Nylas, teams commonly build CRMs, support tools, workflow automation, and AI-powered email features without managing provider-specific email infrastructure.

Which email providers are supported?

The Nylas Email API supports major providers including Gmail, Microsoft Outlook and Exchange, and IMAP-based inboxes. You integrate once and connect to most business and consumer email accounts through a single API.

Can I send emails from my app using my users’ email accounts?

Yes. You can send emails from your application using authenticated user inboxes for workflows like replies, follow-ups, and notifications. Messages are sent through the user’s provider and appear in their Sent folder.

Do I need to build or maintain my own email infrastructure?

No. The Nylas Email API abstracts provider-specific protocols, authentication flows, and edge cases. This allows you to avoid building and maintaining separate integrations for Gmail, Outlook, and IMAP providers.

How does user authentication work for email access?

Users authenticate through secure OAuth flows for supported providers. For some IMAP connections, credentials may be required depending on the provider and security configuration.

Can I track email opens, clicks, or delivery status?

Engagement tracking can be implemented by your application using techniques like tracking pixels, tagged links, or message metadata, depending on provider capabilities. Delivery status and message state can be monitored through API responses and webhook events.

Is the Nylas Email API compliant with GDPR and data privacy requirements?

Nylas provides security controls and data handling features that support GDPR-compliant implementations. Compliance ultimately depends on how your application collects, processes, stores, and retains user data.

How do I handle errors or failed email sends?

The Nylas Email API returns structured error responses and supports webhooks for event-based handling. This makes it easier to detect failed sends, retries, or provider-level issues and respond programmatically.

Can I customize email content and headers?

Yes. You can fully control email content, including subject lines, HTML and plain-text bodies, attachments, and custom headers. This flexibility supports transactional, workflow, and application-driven email use cases.

Why use an Email API instead of building directly on Gmail or Outlook APIs?

Building directly on provider APIs requires maintaining separate integrations and adapting to ongoing provider changes. The Nylas Email API provides a unified abstraction layer, reducing development time and long-term maintenance while supporting multiple providers.