Build email sending into your app with Nylas API


Integrate with the Nylas Email API to connect to Gmail, Outlook, and IMAP accounts. Avoid deliverability issues and create intuitive embedded email experiences — without months of engineering work.

Explore the Email API
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Send Email API

Email sending in your app without the heavy lifting

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Send emails across all providers

Send emails effortlessly across all providers with the Nylas Email API. Seamlessly connect Gmail, Outlook, iCloud, and other iMAP accounts with one integration.

 

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Reach inboxes at the right time

Send timely transactional emails, follow-ups, or scheduled campaigns with our API, ensuring users get order confirmations or reminders when it counts.

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Scale with confidence

Scale email sending effortlessly with Nylas. Our API handles secure, end-to-end integration, enabling CRUD capabilities and bi-directional sync across providers.

Reach inboxes securely, reliably to all email providers. 

Get started quickly building custom email sending features with our documentation and SDKs for Python, Node.js, and more.

Send emails in-app directly and programmatically
  • Draft emails with full control to create, read, update, and delete.
  • Send transactional emails and automated customer support replies with configurable recipients, subject, body, and headers.
  • Keep users engaged with fully embedded email workflows.
  • Tailor sending features to look and feel like your app.
Support batch sending
  • Batch send newsletters, team announcement, and more with a single API call
  • Add to, cc, and bcc fields for efficient outreach
Route messages with built-in SMTP handling
  • Deliver consistently to Gmail, Outlook, and more without managing servers
  • Hands-off reliability that prevents emails getting caught in spam filters
Track email delivery and status
  • Monitor sends, bounces, and failures in real time
  • Build user trust by displaying email statuses in app
Trusted by over 250,000 developers worldwide
  • LifeMD

Build flexible email scheduling into your app in minutes

Rapidly integrate flexible email scheduling into your app with our clear documentation and SDKs for Python, Node.js, and more.

Schedule emails for later
  • Let users schedule follow-ups across any email service.
  • Modify and cancel scheduled emails as needed.
Edit and delete scheduled email send times
  • Adjust a scheduled email if a deadline shifts in a project management app, whether the user uses Gmail or Outlook.
  • Cancel a reminder email if a task is completed early, no matter the provider.
Stay compliant with custom headers
  • Batch send newsletters, team announcement, and more with a single API call
  • Add to, cc, and bcc fields for efficient outreach
Multiple SDKs for seamless integration
  • Use Python, Node.js, and more to get started fast.
  • Leverage SDKs with examples in our documentation.

Add email sending to your app with Nylas

Getting started is simple. 

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Sign Up

Create a Nylas account, get your API key.

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Authenticate

Connect your app to email providers using Nylas’ secure authentication.

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Send Emails

5Use our API to enable email sending for your users.

Use Cases

Bring email power to your customers

Businesses use the Nylas Email API to enhance their apps across industries.

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CRM platforms

Enable sales teams to send and schedule follow-up emails from your CRM app.

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Support tools

Automate ticket closure emails with custom scheduling in your helpdesk app.

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Marketing plarforms

Offer users the ability to schedule drip campaigns directly in your marketing tool.

Meet Nylas

Why developers use Nylas for calendar availability

Works with major providers

Connect to Google, Outlook, Mail and other email providers through one integration.

100%

of email, calendar, and contacts providers connected.

Built for scale

Send individual or bulk emails, or schedule them for later delivery.

Billions

of financial transactions processed daily.

Saves time

Automate email sending and avoid building custom delivery logic.

3 hours

saved daily on operational tasks for users.

Easy to implement

Clear docs and SDKs to get your email automation tool up and running fast.

8x faster

to build features than developing from scratch.

100%

of email, calendar, and contacts providers connected.

Billions

of financial transactions processed daily.

3 hours

saved daily on operational tasks for users.

8x faster

to build features than developing from scratch.

Start sending and scheduling emails from your app today

Try Nylas free and build a custom email experience for your customers. Start with our sandbox for free—no credit card required.

Build for free
See the Docs
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How to send emails with API

Using an Email API is the easiest way to send emails from your app. You won’t have to deal with complex email servers or manual setup.
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What is Email Integration?

Email integrations enable businesses to send automated correspondence based on customer actions or contact data.

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9+ best email APIs in 2025

Send and receive emails in your application, allowing you to focus on building critical, differentiating communications features

Wondering how email sending works?

Need more help? Let’s talk!

Can I use the Nylas Email API to send emails from my own app?

Yes! The Nylas Email API allows you to integrate email sending directly into your business app, so your customers can send emails without leaving your platform.

What email providers does Nylas support for sending emails?

Nylas integrates with major providers like Gmail, Microsoft 365, and IMAP-based services, enabling seamless email sending from your app.

How does email scheduling work with the Nylas API?

You can schedule emails by setting a future send time via the API. Nylas handles the delivery, and you can edit or cancel the schedule as needed—all from your app.

Is the Nylas Email API a standalone email client?

No, the Nylas Email API is not a standalone email client. It’s an API solution designed to help businesses build custom email features into their existing applications. For guidance on building an email client using the Nylas Email API, check out this blog: https://www.nylas.com/blog/how-to-build-an-email-client/

Do I need to build my own scheduling interface?

Not necessarily. While you can build a custom UI, Nylas also provides ready-to-use scheduling components that integrate with the availability API for a faster go-to-market.

 

 

Can I add custom headers for compliance, like unsubscribe links?

Absolutely. The Nylas Email API supports custom headers, making it easy to comply with regulations like GDPR or CAN-SPAM within your app.