测试 SMTP 的替代方案？

Question

我正在尝试开发一个发送电子邮件的应用程序，但我们的内部网络被锁定得非常严密，所以我无法使用我们的内部邮件服务器进行中继。

有人用过 no-ip.com 之类的东西吗？还有其他选择吗？

Answer 1

如果你只需要检查的电子邮件被发送到正确的地址，并用正确的内容，最简单的方法是通过编辑应用程序或web.config文件中使用投递文件夹：

  <system.net>
    <mailSettings>
      <smtp deliveryMethod="SpecifiedPickupDirectory" from="me@myorg.com">
        <specifiedPickupDirectory pickupDirectoryLocation="C:\TestMailDrop"/>
      </smtp>
    </mailSettings>
  </system.net>

这将导致被创建为在指定的目录中的文件的电子邮件。甚至可以然后加载文件，并验证它们作为一个单元测试的一部分。

（如codekaizen指出，这也可以在代码中完成，如果你不介意修改代码/硬编码投递文件夹，并具有行为在调试/释放模式有所不同。）

Answer 2

我同意上述...设置您自己的测试 SMTP 服务器，并将其用于您的测试。

以下是一些可帮助您走上正轨的信息：

http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/e4cf06f5-9a36-474b-ba78-3f287a2b88f2.mspx?mfr=true

http://www.cmsconnect.com/praetor/WebHelpG2/Chapter_2_-_Pre-installation_considerations/Configuring_the_SMTP_Server.htm

http://service1.symantec.com/support/ent-gate.nsf/docid/2007241920754398

Answer 3

您可以将电子邮件保存到磁盘：

#if DEBUG
smtpClient.PickupDirectoryLocation = "\\Path\\to\\save\\folder";
smtpClient.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
smtpClient.Send(msg);
#endif

Answer 4

这@codekaizen Riffing，使用 AutoFixture.xUnit [这是可以作为由该名称的的xUnit包]： -

    [Theory, AutoData]
    public static void ShouldSendWithCorrectValues( string anonymousFrom, string anonymousRecipients, string anonymousSubject, string anonymousBody )
    {
        anonymousFrom += "@b.com";
        anonymousRecipients += "@c.com";

        using ( var tempDir = new TemporaryDirectoryFixture() )
        {
            var capturingSmtpClient = new CapturingSmtpClientFixture( tempDir.DirectoryPath );
            var sut = new EmailSender( capturingSmtpClient.SmtpClient );

            sut.Send( anonymousFrom, anonymousRecipients, anonymousSubject, anonymousBody );
            string expectedSingleFilename = capturingSmtpClient.EnumeratePickedUpFiles().Single();
            var result = File.ReadAllText( expectedSingleFilename );

            Assert.Contains( "From: " + anonymousFrom, result );
            Assert.Contains( "To: " + anonymousRecipients, result );
            Assert.Contains( "Subject: " + anonymousSubject, result );
            Assert.Contains( anonymousBody, result );
        }
    }

CapturingSmtpClientFixture仅在测试环境中使用 -

    class CapturingSmtpClientFixture
    {
        readonly string _path;
        readonly SmtpClient _smtpClient;

        public CapturingSmtpClientFixture( string path )
        {
            _path = path;
            _smtpClient = new SmtpClient { DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory, PickupDirectoryLocation = _path };
        }

        public SmtpClient SmtpClient
        {
            get { return _smtpClient; }
        }

        public IEnumerable<string> EnumeratePickedUpFiles()
        {
            return Directory.EnumerateFiles( _path );
        }
    }

所有你需要做的是确保你的实际代码将已经连线了适合于实时SMTP服务器参数的SmtpClient。

（为了完整起见，这里是TemporaryDirectoryFixture）： -

public class TemporaryDirectoryFixture : IDisposable
{
    readonly string _directoryPath;

    public TemporaryDirectoryFixture()
    {
        string randomDirectoryName = Path.GetFileNameWithoutExtension( Path.GetRandomFileName() );

        _directoryPath = Path.Combine( Path.GetTempPath(), randomDirectoryName );

        Directory.CreateDirectory( DirectoryPath );
    }

    public string DirectoryPath
    {
        get { return _directoryPath; }
    }

    public void Dispose()
    {
        try
        {
            if ( Directory.Exists( _directoryPath ) )
                Directory.Delete( _directoryPath, true );
        }
        catch ( IOException )
        {
            // Give other process a chance to release their handles
            // see http://stackoverflow.com/questions/329355/cannot-delete-directory-with-directory-deletepath-true/1703799#1703799
            Thread.Sleep( 0 );
            try
            {
                Directory.Delete( _directoryPath, true );
            }
            catch
            {
                var longDelayS = 2;
                try
                {
                    // This time we'll have to be _really_ patient
                    Thread.Sleep( TimeSpan.FromSeconds( longDelayS ) );
                    Directory.Delete( _directoryPath, true );
                }
                catch ( Exception ex )
                {
                    throw new Exception( @"Could not delete " + GetType() + @" directory: """ + _directoryPath + @""" due to locking, even after " + longDelayS + " seconds", ex );
                }
            }
        }
    }
}

和一个骨架EmailSender：

public class EmailSender
{
    readonly SmtpClient _smtpClient;

    public EmailSender( SmtpClient smtpClient )
    {
        if ( smtpClient == null )
            throw new ArgumentNullException( "smtpClient" );

        _smtpClient = smtpClient;
    }

    public void Send( string from, string recipients, string subject, string body )
    {
        _smtpClient.Send( from, recipients, subject, body );
    }
}

Answer 5

通常的答案是IIS在本地运行SMTP，但你必须要小心你发送给谁。它实际上可能不如送你平常的SMTP服务器和目标仅占域之内。