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The best email API for serverless functions

Serverless computing is a game-changer. You need an email provider that can keep up and help your serverless email build and scale just as well.

CloudMailin's custom email servers are built for the cloud with speed and reliability built-in from the start.

Inbound email to Webhook

Receive incoming emails via HTTP POST. Emails fully parsed are formatted as JSON, Multipart Form/Data or you can receive the full RAW email. You can even receive large attachments.

Send Email via HTTP or SMTP

Get perfect deliverability without having to lift a finger. Never lose track of where an email is or why your customers didn't receive it.

  • Cloud first with Serverless included

    • Send and Receive email with JSON

      CloudMailin's API is designed to work with serverless functions and cloud services. Send and receive email with JSON and never worry about SMTP again.

    • Offload large attachments

      CloudMailin can offload large attachments to Amazon S3, Google Cloud Storage or Azure Blob Storage. You can then receive just a URL to the file in your webhook.

    • Scale to millions of emails per month

      Whenever you're ready we can scale together to handle as many emails as you can throw at CloudMailin's purpose built servers.

    world map showing global email deliverability and email sending
  • Easy to integrate

    CloudMailin is designed to be easy to integrate with your existing application. We have integrations for all the major languages and frameworks. Whether you're using SMTP or HTTP, sending email or receiving it, we've got you covered.

    email api frameworks image, rails, django, node, php, python, java, go, ruby
  • Always secure and reliable

    Our custom email servers are hardened and proven, you just need to run your website.

    With 99.99% uptime and our detailed insight you'll never be left wondering what happened to your email. Our dashboard gives complete insight into the email you're sending and receiving.

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  • Receive your email via webhook

    CloudMailin allows you to receive email from any device, anywhere in the world by making a POST request over HTTP. The response will be formatted for you and ready to use on your server or in your application.

    Receiving email has never been easier.

    See a Demo

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  • Never worry about deliverability again

    CloudMailin handles your email deliverability so you don't have to. We make sure everything is setup to ensure that your emails hit the inbox quickly every time. CloudMailin provides SPF, DKIM and DMARC by default. We monitor it all so you don't need to.

    You can see every step of your email's journey in our dashboard and you'll always have the insight you need.

    email deliverability image, emails with checkmarks and one deliverability failure


Don't just take our word for it

CloudMailin has been instrumental in our growth at ExpressSteuer. The system is not only incredibly easy to implement, but also highly reliable and robust. What's more, their support team is simply amazing - always quick to respond and provide effective solutions to any challenge we encounter. We couldn't be more pleased with the service provided by CloudMailin!
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Andreas Santoro
CTO, ExpressSteuer
Thanks for the rock solid decade
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The product is perfect, feature rich, nice and intuitive UI and great support. It was really easy to integrate it into our application. It enables our application to receive inbound traffic, to give better support to clients and to expand our mailing options.
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Francisco (Kiko) R.
Head of Engineering,