Free Transactional Email API Designed for Fast and Reliably Delivery

AhaSend is built for delivering transactional emails, fast.
Send, receive, and track emails with AhaSend's free email API. 

By developers, for developers

Integrate in minutes

Our APIs come with OpenAPI specs for easy and fast integration

    -X POST
    -H 'Content-Type: application/json'
    -H 'X-Api-Key: YOUR-API-KEY'
    -d '{
        "from": {
            "name": "My awesome startup"
            "email": "[email protected]"
        "recipients": [
                "name": "Someone",
                "email": "[email protected]"
        "content": {
            "subject": "Sample email",
            "text_body": "Plain text body",
            "html_body": "<p>This is the <b>HTML</b> body</p>",

Install dependencies

$ npm i axios
const axios = require('axios');

const email = {
    from: {
        name: 'My awesome startup',
        email: '[email protected]',
    recipients: [
            name: 'Someone',
            email: '[email protected]',
    content: {
        subject: 'Sample email',
        text_body: 'Plain text body',
        html_body: '<p>This is the <b>HTML</b> body</p>',
};'', email, {
  headers: {
    'Content-Type': 'application/json',
    'X-Api-Key': 'YOUR-API-KEY',
}).then((response) => {

Install dependencies

$ go get
                                                email := gomail.NewMessage()
email.SetAddressHeader("From", "[email protected]", "My awesome startup")
email.SetAddressHeader("To", "[email protected]", "Someone")
email.SetHeader("Subject", "Sample email")
email.SetBody("text/plain", "Plain text body")
email.SetBody("text/html", "<p>This is the <b>HTML</b> body</p>")

// Port can be 25, 2525, or 587
d := gomail.NewDialer("", 587, "YOUR_SMTP_USERNAME", "YOUR_SMTP_PASSWORD")
if err := d.DialAndSend(msg); err != nil {

Install dependencies

$ gem install httparty
require 'httparty'

class AhaSend
  include HTTParty

  base_uri ''
  headers 'X-Api-Key' => ENV['AHASEND_API_KEY'], 'Content-Type' => 'application/json'

  def initialize(from_name:, from_email:)
    @from_name = from_name
    @from_email = from_email

  def send_email(subject:, html_body:, recipient_email:, recipient_name: nil, text_body: nil)
    email = {
      from: { name: @from_name, email: @from_email },
      recipients: [{ name: recipient_name, email: recipient_email }],
      content: { subject:, html_body:, text_body: },
    }'/v1/email/send', body: email)

ahasend = 'My awesome startup', from_email: '[email protected]')
  subject: 'Sample email',
  html_body: '<p>This is the <b>HTML</b> body</p>',
  text_body: 'Plain text body',
  recipient_name: 'Someone',
  recipient_email: '[email protected]'

Install dependencies

$ python -m pip install requests
import requests
email = {
    'from': {
        'name': 'My awesome startup',
        'email': '[email protected]',
    'recipients': [
            'name': 'Someone',
            'email': '[email protected]',
    'content': {
        'subject': 'Sample email',
        'text_body': 'Plain text body',
        'html_body': '<p>This is the <b>HTML</b> body</p>',
headers = {
    'X-Api-Key': 'YOUR_API_KEY',
    'Content-Type': 'application/json'
r ='', json=email, headers=headers)
$email = [
    'from' => [
        'name' => 'My awesome startup',
        'email' => '[email protected]',
    'recipients' => [
            name: 'Someone',
            email: '[email protected]',
    'content' => [
        'subject' => 'Sample email',
        'text_body' => 'Plain text body',
        'html_body' => '<p>This is the <b>HTML</b> body</p>',
$options = array(
  'http' => array(
    'header'  => "Content-type: application/json\r\nX-Api-Key: YOUR-API-KEY",
    'method'  => 'POST',
    'content' => json_encode($email)
$context  = stream_context_create($options);
$resp = file_get_contents('', FALSE, $context);
var_export($resp, TRUE);
Speed Matters

Late delivery is no delivery

When it comes to transactional emails like OTPs and Confirmation emails, delivery speed is everything. AhaSend is built for transactional emails and fast delivery. We consistently deliver emails to Gmail in under 1 seconds, and to other mailbox providers in less than 5 seconds.

Marketing emails are slow and cause delivery delays. We only send transactional emails to ensure high delivery speeds and impeccebale deliverability.

Get your emails to the inbox when it matters.

Email API with fast delivery speeds
Raw, unaltered delivery logs for emails sent through the API
Debugging emails

Get access to raw delivery logs

We respect your intellect and don't dumb down or hide delivery logs!

Get access to raw delivery logs and gain visibility on the lowest level of email delivery details. 

Quickly debug email delivery and deliverability issues with structured, searchable and raw SMTP response logs.


Webhook Events for Your Emails

Build deep emails integrations using webhooks to receive real-time notifications on

  • Email delivery events
  • Suppression list events
  • Tracking events
  • Account related events (such as DNS misconfiguration)
Webhooks for receiving real-time events for messages sent through the email API
Define message routes to receive structured JSON payloads for incoming email messages at your specified API endpoints.
Message Routing

Route your inbound emails

Easily route inbound email to HTTP endpoints. AhaSend automatically parses inbound emails, removing signatures and quoted replies, and provinding the latest reply as a separate field. You can receive structured JSON or raw email data to your endpoints, allowing you to easily integrate emails with your ticketing, CRM or other systems. 

There's more

Everything you need, included.

More features, at no additional cost. We don't like hidden fees either :)


Get insight on email engagement with message open and link click tracking.

Learn more
SMTP Relay

Send emails from any programming language or software using our SMTP relay servers.

Learn more
Message Retention Policies

Customize retention policies for your message data and metadata.

Learn more
Email Archiving

Archive your emails on any s3-compatible block storage service for compliance requirements.

Learn more
Free Dedicated IPs

Large senders sending over 300k emails per month get dedicated IPs - free of charge!

Learn more
Support by engineers

Get support from real engineers and deliverability experts.

Contact support

Start delivering your emails to the inbox now.

Integrate AhaSend email APIs in minutes with a free account. Start delivering emails to your customers with 1,000 free emails per month.