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Unosend is a dedicated transactional email service designed to deliver time-sensitive emails triggered by user actions — such as OTPs, order confirmations, password resets, invoices, and more. It ensures faster delivery, higher inbox placement, and reliable security.
Unosend is for sending transactional emails only. Marketing or bulk promotional emails are not supported to maintain maximum deliverability and sender reputation.

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Features

  • REST API & SMTP — Send via api.unosend.co or smtp.unosend.co:587
  • Email templates — Create, manage, and send with dynamic merge tags
  • Domain authentication — SPF, DKIM, and DMARC verification
  • Real-time webhooks — Get notified on delivery, bounce, open, and click events
  • Suppression management — Automatic bounce/complaint handling + manual suppression lists
  • Email logs & exports — Full delivery logs with export capability
  • File cache — Upload and reuse attachments/inline images across emails
  • Dedicated IP — Available for high-volume senders
  • Open & click tracking — Built-in tracking with per-email control
  • Batch sending — Send to multiple recipients in a single API call
curl -X POST https://api.unosend.co/v1/email \
  -H "Authorization: Bearer un_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "from": {"address": "hello@yourdomain.com", "name": "Your App"},
    "to": [{"email_address": {"address": "user@example.com", "name": "User"}}],
    "subject": "Hello from Unosend",
    "htmlbody": "<p>Your first email.</p>"
  }'

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Get Started

Quick Start

Send your first email in 5 minutes

Authentication

API keys and security

Domain Setup

Verify your sending domain

API Reference

Full endpoint documentation