我猜你的要求主要是围绕让用户看到已发送的电子邮件。 发送的项目文件夹将是允许这种情况发生的一种方法。 在过去，我通过添加一个BCC Address来解决这个问题，该BCC Address可以直接将电子邮件发送到分发列表，用户或共享邮箱，允许用户查看已发送的内容。

尝试使用某种outlook规则将项目移动到标记为读取的已发送项目文件夹…

 using (var mailMessage = new MailMessage( "fromaddress@blah.com", "toaddress@blah.com", "", "fromaddress@blah.com", "subject", "body")) { var smtpClient = new SmtpClient("SmtpHost") { EnableSsl = false, DeliveryMethod = SmtpDeliveryMethod.Network }; // Apply credentials smtpClient.Credentials = new NetworkCredential("smtpUsername", "smtpPassword"); // Send smtpClient.Send(mailMessage); } 

我已经这样做了，所以为了完整性，这里是如何正确地做到这一点。 使用托管交换Web服务（ https://msdn.microsoft.com/en-us/library/dd633709%28EXCHG.80%29.aspx ）：

 ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1); // In case you have a dodgy SSL certificate: System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate(Object obj, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; }; service.Credentials = new WebCredentials("username", "password", "MYDOMAIN"); service.Url = new Uri("https://exchangebox/EWS/Exchange.asmx"); EmailMessage em = new EmailMessage(service); em.Subject = "example email"; em.Body = new MessageBody("hello world"); em.Sender = new Microsoft.Exchange.WebServices.Data.EmailAddress("john.smith@example.com"); em.ToRecipients.Add(new Microsoft.Exchange.WebServices.Data.EmailAddress("bob.smith@example.com")); // Send the email and put it into the SentItems: em.SendAndSaveCopy(WellKnownFolderName.SentItems); 

我一直在寻找这个问题的答案，但不依赖于Exchange Server，而是使用IMAP服务器。 我不知道这是否超出了问题的范围，但我发现它搜索“将已发送的MailMessage发送到已发送的文件夹”，这首先是我的问题。

在我构建自己的解决方案的任何地方都找不到直接答案：

我正在实现save方法作为smtpClient的扩展，因此，我们将使用.SendAndSaveMessageToIMAP()而不是.SendAndSaveMessageToIMAP() 。

 public static class SmtpClientExtensions { static System.IO.StreamWriter sw = null; static System.Net.Sockets.TcpClient tcpc = null; static System.Net.Security.SslStream ssl = null; static string path; static int bytes = -1; static byte[] buffer; static System.Text.StringBuilder sb = new System.Text.StringBuilder(); static byte[] dummy; /// 
 /// Communication with server /// 
 /// The command beeing sent private static void SendCommandAndReceiveResponse(string command) { try { if (command != "") { if (tcpc.Connected) { dummy = System.Text.Encoding.ASCII.GetBytes(command); ssl.Write(dummy, 0, dummy.Length); } else { throw new System.ApplicationException("TCP CONNECTION DISCONNECTED"); } } ssl.Flush(); buffer = new byte[2048]; bytes = ssl.Read(buffer, 0, 2048); sb.Append(System.Text.Encoding.ASCII.GetString(buffer)); sw.WriteLine(sb.ToString()); sb = new System.Text.StringBuilder(); } catch (System.Exception ex) { throw new System.ApplicationException(ex.Message); } } /// 
 /// Saving a mail message before beeing sent by the SMTP client /// 
 /// The caller /// The address of the IMAP server /// The port of the IMAP server /// The username to log on to the IMAP server /// The password to log on to the IMAP server /// The name of the folder where the message will be saved /// The message being saved public static void SendAndSaveMessageToIMAP(this System.Net.Mail.SmtpClient self, System.Net.Mail.MailMessage mailMessage, string imapServer, int imapPort, string userName, string password, string sentFolderName) { try { path = System.Environment.CurrentDirectory + "\emailresponse.txt"; if (System.IO.File.Exists(path)) System.IO.File.Delete(path); sw = new System.IO.StreamWriter(System.IO.File.Create(path)); tcpc = new System.Net.Sockets.TcpClient(imapServer, imapPort); ssl = new System.Net.Security.SslStream(tcpc.GetStream()); ssl.AuthenticateAsClient(imapServer); SendCommandAndReceiveResponse(""); SendCommandAndReceiveResponse(string.Format("$ LOGIN {1} {2} {0}", System.Environment.NewLine, userName, password)); using (var m = mailMessage.RawMessage()) { m.Position = 0; var sr = new System.IO.StreamReader(m); var myStr = sr.ReadToEnd(); SendCommandAndReceiveResponse(string.Format("$ APPEND {1} (\Seen) {{{2}}}{0}", System.Environment.NewLine, sentFolderName, myStr.Length)); SendCommandAndReceiveResponse(string.Format("{1}{0}", System.Environment.NewLine, myStr)); } SendCommandAndReceiveResponse(string.Format("$ LOGOUT{0}", System.Environment.NewLine)); } catch (System.Exception ex) { System.Diagnostics.Debug.WriteLine("error: " + ex.Message); } finally { if (sw != null) { sw.Close(); sw.Dispose(); } if (ssl != null) { ssl.Close(); ssl.Dispose(); } if (tcpc != null) { tcpc.Close(); } } self.Send(mailMessage); } } public static class MailMessageExtensions { private static readonly System.Reflection.BindingFlags Flags = System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic; private static readonly System.Type MailWriter = typeof(System.Net.Mail.SmtpClient).Assembly.GetType("System.Net.Mail.MailWriter"); private static readonly System.Reflection.ConstructorInfo MailWriterConstructor = MailWriter.GetConstructor(Flags, null, new[] { typeof(System.IO.Stream) }, null); private static readonly System.Reflection.MethodInfo CloseMethod = MailWriter.GetMethod("Close", Flags); private static readonly System.Reflection.MethodInfo SendMethod = typeof(System.Net.Mail.MailMessage).GetMethod("Send", Flags); /// 
 /// A little hack to determine the number of parameters that we /// need to pass to the SaveMethod. /// 
 private static readonly bool IsRunningInDotNetFourPointFive = SendMethod.GetParameters().Length == 3; /// 
 /// The raw contents of this MailMessage as a MemoryStream. /// 
 /// The caller. /// A MemoryStream with the raw contents of this MailMessage. public static System.IO.MemoryStream RawMessage(this System.Net.Mail.MailMessage self) { var result = new System.IO.MemoryStream(); var mailWriter = MailWriterConstructor.Invoke(new object[] { result }); SendMethod.Invoke(self, Flags, null, IsRunningInDotNetFourPointFive ? new[] { mailWriter, true, true } : new[] { mailWriter, true }, null); result = new System.IO.MemoryStream(result.ToArray()); CloseMethod.Invoke(mailWriter, Flags, null, new object[] { }, null); return result; } } 

所以Robert Reid的榜样将成为现实

  using (var mailMessage = new MailMessage("fromaddress@blah.com", "toaddress@blah.com", "subject", "body")) { //Add an attachment just for the sake of it Attachment doc = new Attachment(@"filePath"); doc.ContentId = "doc"; mailMessage.Attachments.Add(doc); var smtpClient = new SmtpClient("SmtpHost") { EnableSsl = false, DeliveryMethod = SmtpDeliveryMethod.Network }; // Apply credentials smtpClient.Credentials = new NetworkCredential("smtpUsername", "smtpPassword"); // Send smtpClient.SendAndSaveMessageToIMAP(mailMessage, "imap.mail.com", 993, "imapUsername", "imapPassword", "SENT"); } 

如果要在“已发送邮件”文件夹中包含已发送邮件，则需要从Outlook发送邮件。 此文件夹是Outlook（和许多其他邮件客户端）概念，而不是SMTP概念。

您可以使用Outlook Automation API要求Outlook创建电子邮件并发送它。

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