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

A screenshot of an email message timeline, showing all stages of delivery and tracking.

Trusted us

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.

Screenshot of Coresender control panel showing a statistics screen.

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.

Outlook

2.97s

Apple

4.96s

Gmail

3.82s

AOL

4.21s

Yahoo

4.51s

30-day
average

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.

Email API

Full control over your emails

Send fast and reliably. Use the feedback loop. Manage your suppressions.

curl -X POST https://api.coresender.com/v1/send_email \
  -u 'account_id:api_key' \
  -d $'[ 
    { 
      "from": { 
        "email": "jean.luc@example.com", 
        "name": "Jean-Luc Picard" 
      }, 
      "to": [{ 
        "email": "geordi@example.com", 
        "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": { 
    "rq_time":"0.0229s" 
  } 
}

curl 'https://api.coresender.com/v1/messages/679a453d-7412-49c2-b017-40d2cc16cdf0/events' \ 
  -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": "66.249.90.138"
    }
  }, {
    "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": "tasha@example.com",
  "from_email": "jean.luc@example.com",
  "account_id": "7b0ac968-b3e4-7d2d-8095-aa4cdd118287",
  "event": "message.hard_bounce",
  "smtp_response": "550 5.1.1 <tasha@example.com>: User unknown"</tasha@example.com>
}

curl -X DELETE 'https://api.coresender.com/v1/suppressions/8b3fc946-4964-11db-9138-c2f0f5b54b68' \
  -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": "tasha@example.com",
    "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

Why people love Coresender

Takes email off your shoulders

No need to worry if your emails reach your customers' inboxes.

Provides relevant insights

All your app's email activity is logged and can be traced back if needed.

Easy to integrate

Simple step-by-step configuration. No coding required.

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