Sending emails with Mailpit

⭐ Community Toolkit

To get started with the Aspire Mailpit integrations, follow the Get started with Mailpit integrations guide.

Mailpit doesn’t require a dedicated client integration package. You can use any SMTP library to send emails to Mailpit. The connection information is automatically injected into your application when you reference the Mailpit resource.

Using MailKit

Here’s an example using the popular MailKit library:

dotnet add package MailKit

using MailKit.Net.Smtp;
using MimeKit;

public class EmailService
{
    private readonly string _smtpHost;

    public EmailService(IConfiguration configuration)
    {
        _smtpHost = configuration.GetConnectionString("mailpit")?.Split(':')[0] ?? "localhost";
    }

    public async Task SendEmailAsync(string to, string subject, string body)
    {
        using var message = new MimeMessage();
        message.From.Add(new MailboxAddress("Sender", "sender@example.com"));
        message.To.Add(new MailboxAddress("Recipient", to));
        message.Subject = subject;
        message.Body = new TextPart("plain") { Text = body };

        using var client = new SmtpClient();
        await client.ConnectAsync(_smtpHost, _smtpPort, false);
        await client.SendAsync(message);
        await client.DisconnectAsync(true);
    }
}

Using System.Net.Mail

You can also use the built-in System.Net.Mail APIs:

using System.Net;
using System.Net.Mail;

public class EmailService
{
    private readonly string _smtpHost;

    public EmailService(IConfiguration configuration)
    {
        _smtpHost = configuration.GetConnectionString("mailpit")?.Split(':')[0] ?? "localhost";
    }

    public async Task SendEmailAsync(string to, string subject, string body)
    {
        using var client = new SmtpClient(_smtpHost, _smtpPort);
        using var message = new MailMessage("sender@example.com", to, subject, body);
        await client.SendMailAsync(message);
    }
}