Simple.MailServer

// Introduction // ============ // // To get you started, here an example implementation that saves incoming e-mails into files. // // https://github.com/hanswolff/simple.mailserver // // Mail Server Example: // ====================

using Simple.MailServer.Logging; using Simple.MailServer.Smtp; using Simple.MailServer.Smtp.Config; using System; using System.IO; using System.Text;

namespace Simple.MailServer.Example { class Program { private const string RootMailDir = @"C:\Temp\Mail";

    static void Main()
    {
        // to inject your own logging implement IMailServerLogger
        MailServerLogger.Set(new MailServerConsoleLogger(MailServerLogLevel.Debug));

        using (StartSmtpServer())
        {
            Console.WriteLine("Hit ENTER to return.");
            Console.ReadLine();
        }
    }

    private static SmtpServer StartSmtpServer()
    {
        var smtpServer = new SmtpServer
        {
            Configuration =
            {
                DefaultGreeting = "Simple.MailServer Example"
            }
        };
        smtpServer.DefaultResponderFactory = 
            new DefaultSmtpResponderFactory<ISmtpServerConfiguration>(smtpServer.Configuration)
        {
            DataResponder = new ExampleDataResponder(smtpServer.Configuration, RootMailDir)
            // ... inject other responders here as needed (or leave default)
        };

        smtpServer.BindAndListenTo(IPAddress.Loopback, 25);
        return smtpServer;
    }
}

class ExampleDataResponder : DefaultSmtpDataResponder<ISmtpServerConfiguration>
{
    private readonly string _mailDir;

    public ExampleDataResponder(ISmtpServerConfiguration configuration, string mailDir)
        : base(configuration)
    {
        _mailDir = mailDir;
        EnsureDirExists(mailDir);
    }

    private static void EnsureDirExists(string directory)
    {
        if (!Directory.Exists(directory))
            Directory.CreateDirectory(directory);
    }

    public override SmtpResponse DataStart(SmtpSessionInfo sessionInfo)
    {
        Console.WriteLine("Start receiving mail: {0}", GetFileNameFromSessionInfo(sessionInfo));
        return SmtpResponse.DataStart;
    }

    private string GetFileNameFromSessionInfo(SmtpSessionInfo sessionInfo)
    {
        var fileName = sessionInfo.CreatedTimestamp.ToString("yyyy-MM-dd_HHmmss_fff") + ".eml";
        var fullName = Path.Combine(_mailDir, fileName);
        return fullName;
    }

    public override SmtpResponse DataLine(SmtpSessionInfo sessionInfo, byte[] lineBuf)
    {
        var fileName = GetFileNameFromSessionInfo(sessionInfo);

        Console.WriteLine("{0} <<< {1}", fileName, Encoding.UTF8.GetString(lineBuf));

        using (var stream = File.OpenWrite(fileName))
        {
            stream.Seek(0, SeekOrigin.End);
            stream.Write(lineBuf, 0, lineBuf.Length);

            stream.WriteByte(13);
            stream.WriteByte(10);
        }

        return SmtpResponse.None;
    }

    public override SmtpResponse DataEnd(SmtpSessionInfo sessionInfo)
    {
        var fileName = GetFileNameFromSessionInfo(sessionInfo);
        var size = GetFileSize(fileName);

        Console.WriteLine("Mail received ({0} bytes): {1}", size, fileName);

        var successMessage = String.Format("{0} bytes received", size);
        var response = SmtpResponse.OK.CloneAndChange(successMessage);

        return response;
    }

    private long GetFileSize(string fileName)
    {
        return new FileInfo(fileName).Length;
    }
}

}