Resend .NET SDK

.NET library for the Resend API.

Install

> dotnet add package Resend

Examples

Send email with:

• ASP.NET - Minimal API - Send email from an API
• ASP.NET - Razor - Send email from a Razor web application
• Console app - Send email from console app (without dependency injection)
• Async - Hangfire - Send email as a background job using Hangfire
• Async - Temporal - Send email in durable workflow using Temporal
• Render - Razor - Render an HTML body using Razor views
• Render - Liquid - Render an HTML body using Fluid, a Liquid template language

Setup

First, you need to get an API key, which is available in the Resend Dashboard.

In the startup of your application, configure the DI container as follows:

using Resend;

builder.Services.AddOptions();
builder.Services.AddHttpClient<ResendClient>();
builder.Services.Configure<ResendClientOptions>( o =>
{
    o.ApiToken = Environment.GetEnvironmentVariable( "RESEND_APITOKEN" )!;
} );
builder.Services.AddTransient<IResend, ResendClient>()

You can then use the injected IResend instance to send emails.

Usage

Send your first email:

using Resend;

public class FeatureImplementation
{
    private readonly IResend _resend;


    public FeatureImplementation( IResend resend )
    {
        _resend = resend;
    }


    public async Task Execute()
    {
        var message = new EmailMessage();
        message.From = "onboarding@resend.dev";
        message.To.Add( "delivered@resend.dev" );
        message.Subject = "hello world";
        message.TextBody = "it works!";

        await _resend.EmailSendAsync( message );
    }
}

Send email using HTML

Send an email custom HTML content:

using Resend;

public class FeatureImplementation
{
    private readonly IResend _resend;


    public FeatureImplementation( IResend resend )
    {
        _resend = resend;
    }


    public async Task Execute()
    {
        var message = new EmailMessage();
        message.From = "onboarding@resend.dev";
        message.To.Add( "delivered@resend.dev" );
        message.Subject = "hello world";
        message.HtmlBody = "<strong>it works!</strong>";

        await _resend.EmailSendAsync( message );
    }
}

License

MIT License