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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.

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7-Day Free Trial

Connected
Connected Email Accounts
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

Mery Yard

Outlook WhatsApp LinkedIn
Outlook Outlook
WhatsApp WhatsApp
LinkedIn LinkedIn
Me
Me Monday, 05:09 PM
Hi Michel, What are your needs for the upcoming quarter? Thank you.
MY
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 Automation

Craft seamless automation sequences that enhance engagement across email and messaging channels.

Sequence 1 Active
1
Gmail
E
Email

Hi Elena,

2
LinkedIn
E
Message

Hello,

3
Gmail
E
Email

Good news!

Sequence 2 Inactive
1
Gmail
E
Email

Hi Elena,

2
WhatsApp
E
Message

Hello Elena,

3
LinkedIn
E
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 Integration

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 Integration

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 Integration

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

Discover all Endpoints you can integrate with Email API

Email Endpoints

Account connection

Send/Receive

Organize

Webhooks

Gmail Outlook IMAP
Hosted Auth: White label email auth ✓ ✓ ✓
Custom auth: Connect user with credentials ✓
Use your App OAuth screen ✓ ✓
Gmail Outlook IMAP
Send an Email ✓ ✓ ✓
Reply to an Email ✓ ✓ ✓
List Emails ✓ ✓ ✓
Gmail Outlook IMAP
Delete Email ✓ ✓ ✓
Move Email ✓ ✓ ✓
List Folders ✓ ✓ ✓
Get Folder ✓ ✓ ✓
Gmail Outlook IMAP
New Email ✓ ✓ ✓
Open and Click tracking ✓ ✓ ✓
Account Connection
✓
Hosted Auth: White label email auth
✓
Custom auth: Connect user with credentials
✓
Gmail or Microsoft OAuth: Use your App Oauth screen
Send/Recieve
✓
Send an Email
✓
Reply to an Email
✓
List Emails
Organize
✓
Delete Email
✓
Move Email
✓
List Folders
✓
Get Folder
Webhooks
✓
New Email
✓
Open and Click tracking
All Email features
Built for Developers

Email API Integration for Modern Apps

Connect all major email providers through a single API. Build faster, scale effortlessly, 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
});
Explore API Reference TypeScript Ready
Gmail
Outlook
IMAP
One Unified API

IMAP Simplified

Bypass raw IMAP protocol complexity. Access FastMail, Zoho, AOL, GMX and 50+ providers via simple HTTP API.

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.

/
Acme
/
Application
Documentation
API Reference
Changelog
Connect a new account
Select the type of account you
want to connect
LinkedIn
LinkedIn
WhatsApp
WhatsApp
Instagram
Instagram
Telegram
Telegram
Google
Google
IMAP
IMAP
Microsoft
Microsoft
Google Calendar
Google Calendar
Outlook Calendar
Outlook Calendar

Accounts

20 Operational
0 Authentication required
0 Service interruption
0 Paused
Name ID Status Linked
Operational Linked on
03/01/2025
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Operational Linked on
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Operational Linked on
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Operational Linked on
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Operational Linked on
02/20/2025
Operational Linked on
03/01/2025
Operational Linked on
02/25/2025
Operational Linked on
03/01/2025
Operational Linked on
02/22/2025
Operational Linked on
02/14/2025
Operational Linked on
02/12/2025
Operational Linked on
02/08/2025
Operational Linked on
02/05/2025
Operational Linked on
03/01/2025
Operational Linked on
02/15/2025
Operational Linked on
03/01/2025
Operational Linked on
02/22/2025
Try for free
Dashboard Demo

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.

LinkedIn
Instagram

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.

LinkedIn
WhatsApp
Instagram
Telegram

Messaging API

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

Google Calendar
Outlook Calendar

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.

Our APIs are built for legitimate business use cases. We enforce rate limits and usage policies to ensure a secure, spam-free experience for all users.

2000+ 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
SOC 2 Type II
Certified
Independently audited security controls ensuring data protection and operational integrity.
GDPR
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

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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 engagement with the professional network in check.
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.

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