Developer-centered email delivery service

Professional in-cloud SMTP server & API with reputable IPs and full sender authentication. Easy 10-minute integration.

Get started for free
  • No credit card required
  • EU processing and storage
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Trusted us
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Improve your email delivery rate

Employ the best for the job. Our delivery infrastructure will handle all technical complexity and our team will provide support whenever you need it.

Stop wondering if your customers receive your emails. We make sure they do.
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Wow recipients with instant inbox

Every second counts when your customers are waiting for their sign up confirmation or a password reset link.

Fast delivery is at the core of what we do. And we have the data to back it up. logo
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Powerful insights

Always know what happens to your emails

Have everything under control with real-time data available at your fingertips.

Best SMTP server

Easy SMTP server integration

Want your Wordpress, PrestaShop or SugarCRM to start sending email reliably and fast? Just use our SMTP gateway. We provide step-by-step instructions for the most popular software. No coding required.
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Email API

Full control over your emails

Send fast and reliably. Use the feedback loop. Manage your suppressions.
curl -X POST \
  -u 'account_id:api_key' \
  -d $'[
      "from": {
        "email": "",
        "name": "Jean-Luc Picard"
      "to": [{
        "email": "",
        "name": Geordi La Forge"
      "subject": "I need engines",
      "body": {
        "text": "Geordi, I need engines, now!"
  ]' ⏎

  "data": [{
    "message_id": "679a453d-7412-49c2-b017-40d2cc16cdf0",
    "status": "accepted",
    "errors": []
  "meta": {
curl '' \
  -H 'authorization: Bearer oauth_access_token' ⏎

  "data": [{
    "received_at": "2020-09-07T04:49:50.268699+00:00",
    "type": "open",
    "details": {
      "user_agent": "Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/42.0.2311.135 Safari\/537.36 Edge\/12.246 Mozilla\/5.0",
      "user_ip": ""
  }, {
    "received_at": "2020-09-07T04:49:40.509911+00:00",
    "type": "delivery",
    "details": {
      "smtp_response": "250 2.0.0 Ok: queued as 4413621863B1"
  }, {
    "received_at": "2020-09-07T04:49:32.508000+00:00",
    "type": "new",
    "details": {}
  "meta": {
    "limit": 30,
    "offset": 0,
    "total": 3,
    "rq_time": "0.0013s"
  "received_at": "2020-09-07T04:40:11.065+00:00",
  "message_id": "b7ef43f0-3f66-2c29-a1cd-27a7d170a2e6",
  "custom_id": "abcd-1234",
  "recipient_email": "",
  "from_email": "",
  "account_id": "7b0ac968-b3e4-7d2d-8095-aa4cdd118287",
  "event": "message.hard_bounce",
  "smtp_response": "550 5.1.1 <>: User unknown"</>
curl -X DELETE '' \
  -H 'authorization: Bearer oauth_access_token' ⏎

  "data": [{
    "suppression_id": "8b3fc946-4964-11db-9138-c2f0f5b54b68",
    "account_id": "7b0ac968-b3e4-7d2d-8095-aa4cdd118287",
    "account_name": "My transactional emails",
    "created_at": "2020-09-07T04:40:11.074719+00:00",
    "recipient_email": "",
    "message_id": "b7ef43f0-3f66-2c29-a1cd-27a7d170a2e6",
    "type": "hard_bounce",
    "reason": ""
  "meta": {
    "rq_time": "0.0036s"

Official Coresender libraries

We’ve prepared ready-to-use libraries for Node.js, Python, PHP and Java for you to easily integrate Coresender with your application.
See all on GitHub
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Why people love Coresender

Delivery icon.
Takes email off your shoulders
No need to worry if your emails reach your customers' inboxes.
Feedback icon.
Provides relevant insights
All your app's email activity is logged and can be traced back if needed.
Integrations icon.
Easy to integrate
Simple step-by-step configuration. No coding required.
Stian avatar.
Coresender helps us manage emails for all our customers in a Wordpress based environment. But also using the API and packages available in backend implementations. It is simple, yet extremely powerful for users who'd like to deep dive into the tool.

Stian Instebø
Tech Lead, Markant Norge AS
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Join hundreds of businesses who are sending email better

"Now I have more time to spend on my business, and not on my email server." – Jeffrey Rendon, founder of InterDigital
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