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Prerequisites

To get the most out of this guide, you’ll need to: Prefer watching a video? Check out our video walkthrough below.

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1. Install

dotnet add package Resend

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2. Send emails using HTML

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>();
Send an email using the injected IResend instance: 
using Resend;

public class FeatureImplementation
{
    private readonly IResend _resend;


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


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

        await _resend.EmailSendAsync( message );
    }
}

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3. Try it yourself

Basic Send

Basic email sending

Attachments

Send emails with file attachments

Templates

Send emails using Resend hosted templates

Scheduling

Schedule emails for future delivery

Audiences

Manage contacts and audiences

Domains

Create and manage sending domains

Inbound Webhooks

Receive and process inbound emails

Double Opt-in

Double opt-in subscription flow

Minimal API App

ASP.NET Minimal API application

MVC App

ASP.NET MVC application