Email API to Sync, Send & Receive Emails in Your App

Connect Gmail, Outlook, and IMAP through a single unified API. Enable multi-account email integration in your app with real-time sync, webhooks, and full inbox management.

Build Now Documentation

7-Day Free Trial

Your App

Connected

Connected Email Accounts

Gmail

sarah.miller@gmail.com

1,284

Emails

Synced

Outlook

james.davidson@company.com

856

Emails

Synced

IMAP

contact@mybusiness.io

432

Emails

Synced

3 Accounts All connected

Real-time Sync Webhooks enabled

Secure OAuth 2.0

Boost Client Retention with Advanced Email API Features

Our Email API enhances your CRM with features that boost client retention by streamlining email from Gmail, Outlook, etc., improving engagement without app switching.

Your App

Mery Yard

Outlook

Me Monday, 05:09 PM

Hi Michel, What are your needs for the upcoming quarter? Thank you.

Mery Yard Monday, 07:12 PM

Dear Sarah, for next quarter, we'll need 2,000 units of the flagship model and 1,000 of the budget model. Best.

Retrieve Email

Confidently retrieve work-related emails from any professional inbox, while maintaining the user's personal data privacy.

Send Email

Send emails directly from your platform, ensuring consistent, professional outreach that aligns with your user's workflow.

Track Engagement

Monitor email opens, clicks, and replies in real-time with webhooks to optimize your outreach strategy.

Unify Email and Messaging Workflows

Build seamless engagement sequences across email and messaging channels for your users.

Sequence 1 Active

Email

Hi Elena,

Message

Hello,

Email

Good news!

Sequence 2 Inactive

Email

Hi Elena,

Message

Hello Elena,

Message

Hello,

Competitive Advantage

Stand out with a dual-channel communication tool offering more engagement options than single-channel solutions.

Unified Engagement Solutions

Enhance your platform with unified communication tools that cover all engagement needs.

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Supported Providers

Connect Any Email Provider

Seamlessly integrate Gmail, Outlook, or any IMAP server with dedicated APIs optimized for each platform.

Gmail API

Full access to Gmail features including labels, threads, attachments, and real-time sync via Google OAuth.

OAuth 2.0 authentication

Labels & thread management

Push notifications via webhooks

Explore Gmail API Gmail

Outlook API

Connect Microsoft 365 and Outlook.com accounts with native Graph API integration and folder sync.

Microsoft Graph integration

Folder & category sync

M365 & personal accounts

Explore Outlook API Outlook

IMAP API

Universal email support for any IMAP-compatible provider including Yahoo, Zoho, ProtonMail, and custom servers.

Any IMAP server support

Secure credential handling

Full mailbox synchronization

Explore IMAP API IMAP

Email API

Email API Capabilities

Integrate Gmail, Outlook, and IMAP email providers through a single unified API. Send, receive, organize, and track emails across all major providers with consistent endpoints.

Explore All Endpoints

Account ConnectionAccount

Send / ReceiveSend

Organize

Webhooks

Account Connection

3 endpoints available

Gmail

Outlook

IMAP

Hosted Auth: White label email auth

Custom auth: Connect user with credentials

Use your App OAuth screen

Send / Receive

3 endpoints available

Gmail

Outlook

IMAP

Send an Email

Reply to an Email

List Emails

Organize

4 endpoints available

Gmail

Outlook

IMAP

Delete Email

Move Email

List Folders

Get Folder

Webhooks

2 events available

Gmail

Outlook

IMAP

New Email

Open and Click tracking

Explore API Reference

Built for Developers

Email API Integration for Modern Apps

Connect all major email providers through a single API. Build faster, integrate efficiently, and deliver exceptional email experiences.

Simple Integration

Connect and sync emails with just a few lines of code. Our SDK handles authentication, syncing, and error handling.

email-sync.js

// Connect any email provider in seconds
import { UnipileClient } from 'unipile-node-sdk';

const client = new UnipileClient({
  dsn: 'https://api.unipile.com',
  token: process.env.UNIPILE_TOKEN
});

// Fetch all emails from connected accounts
const emails = await client.email.list({
  limit: 50,
  folder: 'inbox'
});

// Send email with tracking
await client.email.send({
  to: 'contact@example.com',
  subject: 'Hello from Unipile!',
  body: 'Your message here...',
  track_opens: true
});

One Unified API

IMAP Simplified

Skip raw IMAP protocol complexity." ou "Abstract away raw IMAP protocol complexity.

SOC 2 Certified

Enterprise-grade security with full compliance. Your users' data stays protected.

Google Verified

Casa Tier 2 Certified

Use our Google-verified developer account for OAuth. Unipile appears in the permission grant screen. Perfect for POC before your own certification.

Learn more about Casa Tier 2

Real-time Webhooks

Instant notifications for new emails, status changes, and events. No polling required.

Sandbox Environment

Test your integration risk-free with our sandbox. Debug with detailed logs and error tracking.

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Unified Dashboard

One dashboard for all your integrations

Manage all your LinkedIn, WhatsApp, Gmail accounts and more from a single, intuitive interface.

Accounts

20 Operational

0 Authentication required

0 Service interruption

0 Paused

Name ID Status Linked

Michel Opra

acc_01jgpb44tjf... Operational Linked on
03/01/2025

Sarah Johnson

acc_01jgpb55ujk... Operational Linked on
02/15/2025

Thomas Martin

acc_01jgpb66vlm... Operational Linked on
02/10/2025

Michel Opra

acc_01jgpb7tfqf... Operational Linked on
03/01/2025

Emma Wilson

acc_01jgpb8ugr... Operational Linked on
02/28/2025

Lucas Bernard

acc_01jgpb9vhs... Operational Linked on
02/20/2025

Michel Opra

acc_01jgpb4ezwf... Operational Linked on
03/01/2025

Sophie Durand

acc_01jgpb5fax... Operational Linked on
02/25/2025

Michel Opra

acc_01jgpb4vzbf... Operational Linked on
03/01/2025

Marie Lefebvre

acc_01jgpb5wac... Operational Linked on
02/22/2025

Alex Turner

acc_01jgpc1abc... Operational Linked on
02/14/2025

Chloe Davis

acc_01jgpc2bcd... Operational Linked on
02/12/2025

David Chen

acc_01jgpc3cde... Operational Linked on
02/08/2025

Nina Patel

acc_01jgpc4def... Operational Linked on
02/05/2025

Michel Opra

acc_01jgpc9efg... Operational Linked on
03/01/2025

Sarah Johnson

acc_01jgpcafgh... Operational Linked on
02/15/2025

Michel Opra

acc_01jgpcbghi... Operational Linked on
03/01/2025

Marie Lefebvre

acc_01jgpcchij... Operational Linked on
02/22/2025

Try for free

Discover More from Our API Suite

Beyond email, Unipile connects your product to social networks, messaging platforms, and calendars. Build a complete communication layer with a unified API approach.

Social Media API

Access profiles, posts, comments, and engagement data from LinkedIn and Instagram. Perfect for enrichment, social listening, or building audience insights into your platform.

Messaging API

Connect LinkedIn, WhatsApp, Instagram and Telegram messaging to send, receive, and manage conversations programmatically. Build unified inbox features and outreach capabilities in your app.

Calendar API

Sync Google Calendar and Outlook events in real time. Create, update, and manage meetings directly from your product. Ideal for scheduling features and CRM integrations.

6000+ Companies Innovating with Unipile

Trusted by industry leaders

1 API

Streamline operations for all major communication channels

2 Days

Achieve live integration quickly with minimal setup

30%

Reduction in maintenance efforts and resources

Built-In Security and Compliance

Enterprise-grade protection for your data and workflows Learn more about our security

SOC 2 Type II

Certified

Independently audited security controls ensuring data protection and operational integrity.

GDPR

Compliant

Full compliance with European data protection regulations for user privacy.

99.9%

Platform Uptime over the last 24 months

24/7

Global Support with high-performance API

Email API FAQ

Everything you need to know about integrating Unipile's Email API into your platform

01 How does the Gmail API benefit my CRM system?

The Gmail API provides access to a massive user base of 1.5 billion worldwide users. By integrating it into your CRM, you can sync contacts effortlessly, eliminate manual data entry, and expand your reach to a significant portion of the global email user community.

02 What advantages does the Email API offer for data integration?

The Email API streamlines data integration by enabling the retrieval and synchronization of contact data from Gmail and Outlook directly into your CRM, saving valuable development time and resources.

03 What is the benefit of Unipile's Email API?

Unipile's Email API allows you to connect and unify all your email-related operations. It seamlessly integrates with services like Gmail and Microsoft Outlook, simplifying communication, offering in-depth data insights, and enhancing user engagement.

04 How can the Outlook API transform email management?

The Outlook API, with its 400 million user base, offers robust email and productivity tools. It allows businesses to establish bi-directional sync and enjoy full CRUD capabilities, providing powerful email functionalities that enhance productivity.

05 What is the primary advantage of using the IMAP API?

The IMAP API provides real-time access to email data, simplifying email handling, boosting productivity, and enhancing user experiences by seamlessly integrating email with various applications.

06 Can Unipile's APIs improve customer satisfaction?

Absolutely, by providing a 360-degree view of interactions and ensuring no message goes unnoticed, Unipile's APIs can significantly increase your Customer Satisfaction (CSAT) scores.

07 How can Email API integration benefit different industries?

Email API integration streamlines email communication across platforms like Gmail and Outlook, offering a consolidated view of interactions with customers, leads, and partners. This simplifies workflows and enhances productivity, benefiting various industries.

08 Why should I consider using Unipile's developer-friendly APIs?

Unipile's APIs are user-friendly and easily integrated, even for non-coders. They accelerate product development, provide a hassle-free solution for communication requirements, and reduce maintenance stress with proactive maintenance. Feel free to contact us for more detailed API documentation and integration instructions.

09 How can I contact the team for an integration?

Tell us about your project here. We look forward to discussing how Unipile can support your communication needs! Feel free to access our API documentation here.

10 What does the free Email API offer?

You can start using Unipile's API services for free with a 7-day trial. No credit card is required, and during this period, you'll have full access to all features and functionalities, giving you the flexibility to explore our services without any commitment. Visit our pricing page for more details.

11 How can I prevent excessive use of the Email API to avoid account suspension?

To prevent overuse of the Email API and maintain compliance, consider implementing usage limitations on your end to control the volume of messages sent by your users. This proactive approach helps avoid potential account issues and keeps your email usage compliant with provider guidelines.

12 What is Casa Tier 2 and how does it benefit my integration?

Casa Tier 2 is a security certification required by Google for apps accessing sensitive Gmail data. Unipile is Casa Tier 2 certified, which means you can leverage our infrastructure without going through the lengthy and complex certification process yourself. This allows you to go live faster while maintaining full compliance with Google's security requirements.

Still have questions? Our team is here to help.