How do I view the captured emails?

Mailpit provides a web-based UI (typically on port 8025) which is automatically linked in the .NET Aspire dashboard when using this integration.

Does this skill send real emails to external addresses?

No, it uses Mailpit to capture all outgoing SMTP traffic locally within your development environment, ensuring no real emails are sent to actual recipients.

Can I use this for automated integration testing?

Yes, this skill includes a Mailpit API client pattern that allows your test suite to programmatically verify that specific emails were sent with the expected content.

Do I need to install Mailpit on my machine manually?

No, the skill provides the configuration to run Mailpit as a containerized resource directly through the .NET Aspire AppHost.

Which SMTP library is recommended with this skill?

The skill is designed to work with MailKit, which is the industry standard for modern .NET applications.

Aspire Mailpit Email Integration

Name: Aspire Mailpit Email Integration
Author: Aaronontheweb

byAaronontheweb

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423

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Security & Testing

Integrates Mailpit with .NET Aspire to capture and inspect outgoing emails during local development and integration testing.

This skill provides a comprehensive pattern for implementing local email testing in .NET Aspire applications using Mailpit. It streamlines the setup of SMTP containers, configures MailKit-based email senders, and provides robust integration testing patterns to verify email delivery, content, and headers without sending real messages. It is ideal for developers needing to debug HTML email rendering or automate email-related workflows in a localized environment while maintaining parity with production-ready SMTP configurations.

Key Features

01Automated Mailpit container configuration for .NET Aspire AppHost

02Reusable MailKit-based email sender implementation with SSL support

03Patterns for verifying email content, headers, and asynchronous delivery

04Programmatic Mailpit API client for automated integration tests

05423 GitHub stars

06Standardized SMTP configuration patterns for local and production environments

Use Cases

01Debugging HTML email layout and rendering locally without needing a real SMTP server

02Setting up a zero-cost, isolated email testing infrastructure for .NET Aspire development teams

03Writing integration tests that verify welcome emails or password reset links are sent correctly

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add aaronontheweb/dotnet-skills aspire-mailpit-integration

For use in Claude.ai and ChatGPT

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