.Net邮件发送功能异常，求救！！！【100分】

[Trouble___Maker]

本地发送一切正常，能够发送成功！
上传到服务器上后就出现了这种问题！（PS：服务器只是租的一个虚拟空间。）
异常信息如下：
（高手速来帮小弟看看！谢谢！）

System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: 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 74.125.53.109:25

at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)

at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)

--- End of inner exception stack trace ---

at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout)

at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback)

at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback)

at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)

at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)

at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)

at System.Net.Mail.SmtpClient.GetConnection()

at System.Net.Mail.SmtpClient.Send(MailMessage message)

--- End of inner exception stack trace ---

at System.Net.Mail.SmtpClient.Send(MailMessage message)

at SendMail.ProcessRequest(HttpContext context)

[Trouble___Maker]

[Quote=引用 2 楼 insus 的回复:]

是不是服务器block了。
[/Quote]
能够得到的异常信息就这些

[Trouble___Maker]

string strMailFrom = ConfigurationManager.AppSettings["mailFrom"];
            string strMailFromPass = ConfigurationManager.AppSettings["MailFromPass"];
            string strSmtpServer = ConfigurationManager.AppSettings["SmtpServer"];
            SmtpClient client = new SmtpClient(strSmtpServer); //邮件发送类
            client.UseDefaultCredentials = false; 

            client.Credentials = new NetworkCredential(strMailFrom, strMailFromPass);

            client.EnableSsl = true;
            
            client.DeliveryMethod = SmtpDeliveryMethod.Network;

            string strSubject = string.Empty;
            System.Text.StringBuilder strBody = new System.Text.StringBuilder();

            strBody.Append("From:  " + context.Request["frm_name"] + "   <br />");
            strBody.Append("EMail:  " + context.Request["frm_email"] + "   <br />");
            //strBody.Append("Subject:  " + context.Request["frm_subject"] + "   <br />");
            strSubject = context.Request["frm_subject"];
            strBody.Append("Message:  " + context.Request["frm_message"] + "   <br />");

            MailMessage message = null;


            message = new MailMessage(strMailFrom, strMailTo, strSubject, strBody.ToString());

            message.BodyEncoding = System.Text.Encoding.UTF8; 
            message.IsBodyHtml = true;
            try
            {
                client.Send(message);
            }
            catch (Exception ex)
            {
                context.Response.Write(ex.ToString());
            }

[七色鸟]

帮博哥顶贴啊！
人气，，人气呢？

[七色鸟]

http://blog.csdn.net/andrew_wx/article/details/6950555
这里面有一个，参考参考。

[Trouble___Maker]

[Quote=引用 5 楼 vincent_void 的回复:]

帮博哥顶贴啊！
人气，，人气呢？
[/Quote]
操，别发这种没营养的文字好吧

[天下如山]

[Quote=引用 7 楼 wbloveilove 的回复:]
引用 5 楼 vincent_void 的回复:

帮博哥顶贴啊！
人气，，人气呢？

操，别发这种没营养的文字好吧
[/Quote
蛋疼。

[夜色镇歌]

试试这个。。

        /// <summary>
        /// 用于发邮件的方法
        /// </summary>
        /// <param name="username">显示的发件人名称</param>
        /// <param name="subject">显示的主题名称</param>
        /// <param name="toname">收件人邮箱号码</param>
        /// <param name="body">内容</param>
        public static void SendMessage(string username, string subject, string toname, string body)
        {
            MailAddress from = new MailAddress("[e-mail]", username);
            MailMessage mail = new MailMessage();
            mail.Subject = subject;
            mail.From = from;
            //设置邮件的收件人
            string address = "";
            string displayName = "";

            string[] mailNames = (toname + ";").Split(';');
            foreach (string name in mailNames)
            {
                if (name != string.Empty)
                {
                    if (name.IndexOf('<') > 0)
                    {
                        displayName = name.Substring(0, name.IndexOf('<'));
                        address = name.Substring(name.IndexOf('<') + 1).Replace('>', ' ');
                    }
                    else
                    {
                        displayName = string.Empty;
                        address = name.Substring(name.IndexOf('<') + 1).Replace('>', ' ');
                    }
                    mail.To.Add(new MailAddress(address, displayName));
                }
            }
            //设置邮件的内容
            mail.Body = body;
            //设置邮件的格式
            mail.BodyEncoding = System.Text.Encoding.UTF8;
            mail.IsBodyHtml = true;
            //设置邮件的发送级别
            mail.Priority = MailPriority.Normal;
            mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
            SmtpClient client = new SmtpClient();
            //设置用于 SMTP 事务的主机的名称，填IP地址也可以了
            client.Host = "smtp.163.com";
            //设置用于 SMTP 事务的端口，默认的是 25
            //client.Port = 25;
            client.UseDefaultCredentials = false;
            //这里才是真正的邮箱登陆名和密码，比如我的邮箱地址是 hbgx@hotmail， 我的用户名为 hbgx ，我的密码是 xgbh
            client.Credentials = new System.Net.NetworkCredential("邮箱帐号", "密码");
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            //都定义完了，正式发送了，很是简单吧！
            client.Send(mail);
        }

[KimoGao]

建议看下我的一篇文章
http://blog.csdn.net/keymo_
其中的“学习笔记37”

[Trouble___Maker]

关于这个功能，我已经测试过了，在本地可以发送成功，其他服务器上也可以发生成功，唯独在现在的服务器上不行。所以问题和程序本身的关系不大，估计应该是服务器的问题，但是具体是什么问题却不知道，所以请知道的高人提醒小弟下，再次感谢！

[xiaoyu821120]

你telnet一下邮件服务器25端口，或者用outlook试着发送一下邮件

[Trouble___Maker]

[Quote=引用 12 楼 xiaoyu821120 的回复:]

你telnet一下邮件服务器25端口，或者用outlook试着发送一下邮件
[/Quote]
服务器是租的虚拟空间，连远程桌面都没有，只有ftp。

[翘楚时代]

System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: 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 74.125.53.109:25

口译：系统.NET WEB异常：未能链接远程服务器——》.NET Sockets异常：尝试链接失败，原因是因为在特定时间内未能取得响应，或者设置的链接因为未能取得74.125.53.109:25的主机响应

我的理解是：你的虚拟空间FTP不能使用主机服务器的SMTP服务，不能与主机进行通信导致的。联系服务提供商吧！

[子夜__]

果断联系服务商。

[yespie]

System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server --->

ping下来远程服务器。看看连接是不是正常，然后用 telnet xxx.xxx.xxx.xxx 端口 看看这样能不能连接邮件服务器。

[EnForGrass]

[Quote=引用 15 楼 wxr0323 的回复:]

果断联系服务商。
[/Quote]
果断支持子夜，服务器

[释迦苦僧]

一般企业邮箱 貌似 在一定时间内 对同一个IP下发送的邮件数量有限制
163的貌似是60份在一小时内

[bzyqidaiwanmei]

帮忙顶一下,我得项目现在在服务器也有不少问题

[IE11下面经常卡到爆]

应该是SMTP端口被那边给封了

[Trouble___Maker]

看来这帖子又要沉了

[Trouble___Maker]

[Quote=引用 20 楼 dongxinxi 的回复:]

应该是SMTP端口被那边给封了
[/Quote]
我也觉得要么是防火墙的问题，要么是端口的问题。