C# SDK

Send HIPAA compliant email with C#

Add secure, transactional email to any C# app with the Paubox .NET SDK. BAA included, TLS 1.2+ by default.

C# SDK

Integrate with any C# app

Drop the Paubox .NET SDK into your existing C# stack and start sending in minutes.

.NETASP.NET
Read the quickstart
Program.cs
using Paubox;

var emailLib = new EmailLibrary("YOUR_API_KEY", "YOUR_USERNAME");

var message = new Message
{
    Recipients = new[] { "recipient@example.com" },
    Header = new Header
    {
        From    = "sender@yourdomain.com",
        Subject = "Your first Paubox email"
    },
    Content = new Content
    {
        PlainText = "This message was sent with the Paubox C# SDK."
    }
};

SendMessageResponse response = emailLib.SendMessage(message);
Console.WriteLine("Sent. Tracking ID: " + response.SourceTrackingId);
Get started

All you need to get started

Resources to help you integrate HIPAA compliant email into your application quickly.

Quickstart

Follow the step-by-step guide to send your first secure email.

Read guide

Example repository

Clone the open-source example to get running with the SDK in minutes.

See code

API reference

Understand every REST endpoint and parameter available to your application.

Check docs
Loved by developers

Healthcare teams ship faster on Paubox

"Using Paubox Email API for our system notifications saves our customers time, saves them trouble, and gives them more information."

Morgan Smith Coral
Morgan SmithCoral

"The ease of implementation was really, really helpful. And is still helpful today because we were able to prototype and release new features easily."

Tyler Laracuente
Tyler LaracuenteRollover Rep
FAQ

Frequently asked questions

Everything you need to know about sending HIPAA compliant email with C#.

Does Paubox have a C# SDK?

Yes. The Paubox C# SDK is the official client library for the Paubox Email API. It sends HIPAA compliant transactional email and works in any C# application.

How do I install the Paubox C# SDK?

Download or clone the SDK and add lib/Paubox.Email.API.dll as a reference in your project, then set your Paubox API credentials as environment variables. See the C# quickstart for the full setup.

How do I send HIPAA compliant email in C#?

Install the SDK, configure your Paubox API credentials, build a message with your recipients, subject, and content, then call the send method. Most teams send their first message in minutes. See the C# quickstart for a complete example.

Does it work with popular C# frameworks?

Yes. The SDK is a standard C# package, so it drops into ASP.NET Core and .NET worker services. You call it the same way from anywhere in your C# code.

Is the Paubox C# SDK HIPAA compliant?

Yes. Every plan includes a signed business associate agreement (BAA) and enforces transport layer security (TLS) 1.2 or higher by default, so messages are compliant out of the box.

Is a BAA included?

Yes. A business associate agreement (BAA) comes with every plan, including the free tier, so you can send protected health information (PHI) from your C# app without signing a separate agreement.

Can I send bulk and templated email from C#?

Yes. The SDK supports single sends, bulk sends, and reusable dynamic templates. Store a personalized template once and render it at send time with per-recipient values.

How is this different from sending with System.Net.Mail?

System.Net.Mail sends email but does not make you HIPAA compliant on its own. With Paubox you get a BAA and HIPAA compliant infrastructure, and you can either use the C# SDK or keep System.Net.Mail and point it at the Paubox SMTP relay.

What does it cost, and is there a free tier?

You can send 300 emails per month for free, BAA included. Paid plans scale from there to millions of messages. See the pricing page for current tiers.

Send 300 emails per month, free

Integrate HIPAA compliant email in minutes. Easy for recipients to read, available in 10 SDK languages.