连接尝试失败，因为连接方在一段时间后没有正确响应，或者建立的连接失败，因为连接的主机无法响应。 [英] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

问题描述

using (var imapClient = new ImapClient(host, userName, passWord, ImapClient.AuthMethods.Login, 993, true))
              {
                  if (type == "inbox")
                  {
                      imapClient.SelectMailbox("INBOX");
                  }
                  else if (type == "draft")
                  {
                      imapClient.SelectMailbox("[Gmail]/Drafts");
                  }
                  else if (type == "sent")
                  {
                      imapClient.SelectMailbox("[Gmail]/Sent Mail");
                  }
                  else if (type == "spam")
                  {
                      imapClient.SelectMailbox("[Gmail]/Spam");
                  }
                  else if (type == "trash")
                  {
                      imapClient.SelectMailbox("[Gmail]/Trash");
                  }
                  messages = new List<MailMessage>(imapClient.GetMessageCount());
                  int Msgcount = imapClient.GetMessageCount();
                  AllMsgCount = Msgcount;

                  if (Msgcount < NoRows)
                  {
                      messages = imapClient.GetMessages(0, Msgcount, false, seenUnseen).ToList();

                  }
                  else
                  {
                      if (lastMsgCount == 0)
                      {
                          lastMsgCount = 20;
                      }
                      lastMsgCount = Msgcount - lastMsgCount;
                      if (Msgcount >= 0)
                      {
                          if (tmpnorows > 0)
                          {
                              messages = imapClient.GetMessages(Msgcount, Msgcount + tmpnorows, false, seenUnseen).ToList();
                          }
                          else
                          {
                              messages = imapClient.GetMessages(Msgcount, Msgcount - 10, false, seenUnseen).ToList(); ;
                          }
                          //messages = imapClient.GetMessages(Msgcount, Msgcount - 20, false, seenUnseen)..Where(m => !m.Flags.HasFlag(Flags.Seen) && !m.Flags.HasFlag(Flags.Deleted)).ToList();

                      }
                  }

推荐答案

你正在使用gmail - 所以你应该试试

you're using gmail - so you should try

telnet <your imap host address> 993 

看看你是否收到回复，并从那里开始追踪网络路径，看看你是否有外部连接/防火墙问题

to see if you get a response, and start tracing the network path from there to see if you have external connectivity/firewall issues

确定没问题，由于某些服务器托管问题，我的代码工作正常，除了gmail中的一些更改外，我得到了那种类型的错误。

ok fine thats code working fine due to some server hosting problam i got that type of error excepting some changes in gmail .

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