ASP.NET Exchange 服务器发送电子邮件 C#

Question

好的，当我输入这个时，我注意到可能涵盖相同问题的不同主题。我访问了他们中的大多数，发现与我的要求没有直接关系，所以我请求耐心。

无论如何，我正在使用 VS2010 创建一个 ASP.NET Web 应用程序。我正在尝试使用代码通过 smtp 发送电子邮件：

        MailMessage mailMsg = new MailMessage();

        mailMsg.From = new MailAddress(fromEmail);
        mailMsg.To.Add(toEmail);
        mailMsg.Subject = emailSubj.ToString().Trim();
        mailMsg.Body = msgBody.ToString().Trim();
        SmtpClient smtpClient = new SmtpClient();
        smtpClient.Send(mailMsg);

但每次我得到以下异常（SMTPException 和 innerException 说{"Unable to connect to the remote server"}

我还在 web.config 中定义了以下内容：

<system.net>
  <mailSettings>
    <smtp>
      <network host="company.com"/>
    </smtp>
  </mailSettings>
</system.net>

我要做的是在提交带有请求 ID 的表单后发送一封电子邮件，以便可以通过其他页面访问它（除邮件之外的所有作品）。在我们使用 Exchange 服务器的公司中，当我转到我的联系人属性时，我得到 smtp:emailaddress@company.com

那么这里要做什么呢？我已经检查了Web Services ExchangeServiceBinding，但无法真正找到可以直接帮助我的东西（因此感谢任何链接）

非常感谢，期待阅读您的回复:)

Answer 1

试试这个独立的 C# 应用程序，看看主机名是否有效。否则，您需要联系管理员以获取正确的地址。

      /// <summary>
      ///Method to Send an Email informing interested parties about the status of data extraction. 
      /// INPUTS : int iProcessIsSuccess : int informing about the success of the process. -1 means failure, 0 means partial success, 1 means success. 
      ///          string szLogDataToBeSent :  Log data to be sent incase process not successful.
      /// OUTPUTS : bool. True if success, else false.
      /// </summary>
      public bool SendEmailNotification(string szEmailAddressFileName, int iProcessIsSuccess, string szLogDataToBeSent)
      {
         bool bSuccess = false;

         //the the SMTP host.
         SmtpClient client = new SmtpClient();

         //SMTP Server
         client.Host = CommonVariables.EMAIL_SMTP_SERVER;

         //SMTP Credentials
         client.Credentials = new NetworkCredential(CommonVariables.EMAIL_USERNAME, CommonVariables.EMAIL_PASSWORD);

         //Creating a new mail.
         MailMessage mail = new MailMessage();

         //Filling 'From' Tab.
         mail.From = new MailAddress(CommonVariables.EMAIL_SENDERS_ADDRESS, CommonVariables.EMAIL_SENDERS_NAME);

         //Filling 'To' tab.
         List<EmailAddress> EmailAddressList = new List<EmailAddress>();
         try
         {
            using (System.IO.FileStream fs = new FileStream(szEmailAddressFileName, FileMode.Open))
            {
               XmlSerializer xs = new XmlSerializer(typeof(List<EmailAddress>));
                EmailAddressList = xs.Deserialize(fs) as List<EmailAddress>;
            }

            foreach (EmailAddress addr in EmailAddressList)
            {
               mail.To.Add(addr.RecepientEmailAddress);
            }
         }
         catch(Exception Ex)
         {
            mail.To.Add("DefautEmailId@company.com");
         }

         //Filling mail body.
         string szMailBody = "";
         string szMailSubject = "";

         if (1 == iProcessIsSuccess) //Success
         {
            szMailSubject = String.Format(CommonVariables.EMAIL_SUBJECT_BOILER_PLATE, "a SUCCESS");
            szMailBody = String.Format(CommonVariables.EMAIL_BODY_BOILER_PLATE, DateTime.UtcNow.ToString(), Environment.MachineName);
            szMailBody += "\r\n" + szMailSubject + "\r\n";

         }
         else if (0 == iProcessIsSuccess) //Partially Success
         {
            szMailSubject = String.Format(CommonVariables.EMAIL_SUBJECT_BOILER_PLATE, "a PARTIAL SUCCESS"); ;
            szMailBody = String.Format(CommonVariables.EMAIL_BODY_BOILER_PLATE, DateTime.UtcNow.ToString(), Environment.MachineName);
            szMailBody += "\r\n"+ szMailSubject + "\r\n";
            szMailBody += "\r\n" + "The Log data is as follows:\r\n";
            szMailBody += szLogDataToBeSent;
            mail.Priority = MailPriority.High;
         }
         else //Failed
         {
            szMailSubject = String.Format(CommonVariables.EMAIL_SUBJECT_BOILER_PLATE, "a FAILURE"); ;
            szMailBody = String.Format(CommonVariables.EMAIL_BODY_BOILER_PLATE, DateTime.UtcNow.ToString(), Environment.MachineName);
            szMailBody += "\r\n" + szMailSubject + "\r\n";
            szMailBody += "\r\n" + "The Log data is as follows:\r\n";
            szMailBody += szLogDataToBeSent;
            mail.Priority = MailPriority.High;
         }

         mail.Body = szMailBody;

         mail.Subject = szMailSubject;

         //Send Email.
         try
         {
            client.Send(mail);
            bSuccess = true;
         }
         catch (Exception Ex)
         {
            bSuccess = false;
         }

         // Clean up.
         mail.Dispose();


         return bSuccess;

      }

   }

Answer 2

与您的系统管理员交谈并获取您需要配置的 Exchange Server 的名称。

Answer 3

有时 smtp 服务器与您所看到的不同。 例如： 我的电子邮件是 myemployee@mycompany.com， 我实际的 smtp 服务器是 server1.mail.mycompany.com、server2.mail.mycompany.com 您必须向管理员询问此服务器名称

然后询问您的用户是否在 AD 上定义，是否需要对每个 smtp 发送进行身份验证？

您的交换主机是否使用 SMTP over TLS ？ AFAIK 一些交换管理员声明使用 SMTP over SSL 或 TLS。您可以通过获取其电子邮件的当前 Exchange/Windows 证书来查看有关使用 SMTP over SSL 或 TLS 发送的 MSDN 文档。

Answer 4

      string _SMTP = WebConfigurationManager.AppSettings["SMTP"];
      Int32 _Port = Convert.ToInt16(WebConfigurationManager.AppSettings["Port"]);
      string _SMTPCredentialName = WebConfigurationManager.AppSettings["SMTPCredentialName"];
      string _SMTPCredentialPassword = WebConfigurationManager.AppSettings["SMTPCredentialPassword"];
      string _Body = null;

        System.Net.Mail.MailMessage _MailMessage = new System.Net.Mail.MailMessage();
        try
        {
            _MailMessage.To.Add(_RegUserEmail);
            _MailMessage.From = new System.Net.Mail.MailAddress(_FromEmail, _FromName);
            _MailMessage.Subject = _Subject;
            _Body = ReadTemplateRegistration(_RegisterName, _RegUserName, _RegUserEmail, _Pass, _Path);
            _MailMessage.BodyEncoding = System.Text.Encoding.GetEncoding("utf-8");

            AlternateView plainView = AlternateView.CreateAlternateViewFromString(System.Text.RegularExpressions.Regex.Replace(_Body, "<(.|\\n)*?>", string.Empty), null, "text/plain");
            AlternateView htmlView = AlternateView.CreateAlternateViewFromString(_Body, null, "text/html");

            _MailMessage.AlternateViews.Add(plainView);
            _MailMessage.AlternateViews.Add(htmlView);

            System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient(_SMTP, _Port);

            System.Net.NetworkCredential basicAuthenticationInfo = new System.Net.NetworkCredential(_SMTPCredentialName, _SMTPCredentialPassword);

            mailClient.UseDefaultCredentials = false;

            mailClient.Credentials = basicAuthenticationInfo;

            _MailMessage.IsBodyHtml = true;

            mailClient.Send(_MailMessage);
        }
        catch (Exception ex)
        {

            return "ERROR" + ex.ToString();
        }

这是使用 C# 发送电子邮件的最佳方法，您可以在所有正在进行的电子邮件系统中使用此方法，包括 Exchange 服务器、pop3、smtp、Gmail、Hotmail Yahoo 等。