Set up Papercut SMTP with the Aspire integration

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⭐ Community Toolkit

Use this hosting integration to run Papercut SMTP as a container resource for local email testing. For an introduction, see Get started with Papercut SMTP integration.

Installation

aspire add communitytoolkit-papercutsmtp

Aspire CLI интерактивен; выберите подходящий результат поиска при запросе:

Select an integration to add:

> communitytoolkit-papercutsmtp (CommunityToolkit.Aspire.Hosting.PapercutSmtp)
> Other results listed as selectable options...

#:package CommunityToolkit.Aspire.Hosting.PapercutSmtp@*

<PackageReference Include="CommunityToolkit.Aspire.Hosting.PapercutSmtp" Version="*" />

Add a Papercut SMTP resource

The optional httpPort and smtpPort arguments pin the host ports for the web console and SMTP listener. If omitted, Aspire assigns ports.

TypeScript
C#

import { createBuilder } from './.aspire/modules/aspire.mjs';

const builder = await createBuilder();
const papercut = await builder.addPapercutSmtp('papercut', {
  httpPort: 8080,
  smtpPort: 2525,
});

const mailer = await builder.addProject('mailer', '../Mailer/Mailer.csproj');
await mailer.withReference(papercut);
await mailer.waitFor(papercut);

await builder.build().run();

var builder = DistributedApplication.CreateBuilder(args);
var papercut = builder.AddPapercutSmtp("papercut", httpPort: 8080, smtpPort: 2525);

builder.AddProject<Projects.Mailer>("mailer")
    .WithReference(papercut)
    .WaitFor(papercut);

// After adding all resources, run the app...
builder.Build().Run();

The resource provides an SMTP connection string in the form Endpoint=smtp://host:port. Referencing applications receive the connection under the resource name, such as ConnectionStrings:papercut in .NET configuration. Configure your SMTP library with the host and port from that endpoint. Papercut’s web console is available through the resource’s HTTP endpoint in the Aspire dashboard.

The integration does not provide an email client library. Use an SMTP library in the consuming app, and use WaitFor when the app must wait for Papercut to be ready before starting.

AppHost API

Method	Purpose
`AddPapercutSmtp` / `addPapercutSmtp`	Add Papercut SMTP and optionally pin its HTTP and SMTP host ports.