C#发送邮件为何出现下列错误？？？？

dennisberg1234 2012-06-11 10:04:38

       protected void SendMail()

        {

            try

            {

                //create the mail message

                MailMessage myMail = new MailMessage();

                //set the addresses

                myMail.From = new MailAddress("service@gn.com.cn");

                myMail.To.Add( "593234579@qq.com");

                //set the content

                myMail.Subject = "有短信未发送" + DateTime.Now.ToLongTimeString();

                myMail.Body = "有" + MyClass.Dlookup("select count(*) from sms where dirty = 1 and datediff(day,updatetime,getdate())>1") + "条短信未发出";

                //send the message

                SmtpClient smtp = new SmtpClient("mail.gn.com.cn");

                smtp.Credentials = new NetworkCredential("service@gn.com.cn", "51012345");

                smtp.Send(myMail);



            }

            catch (Exception e)

            {

                lbMessage.Text = e.Message;

            }

        }

为何出现了以上错误？？？

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dennisberg1234 2012-06-11

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[Quote=引用 1 楼的回复:]

应当是你的邮件服务器配置问题
直接给你一个类吧
C# code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Mail;
using System.Configuration;

public class SendMai……
[/Quote]

是不是和451 MI:RBL 发信IP位于一个或多个RBL里。请参考http://www.rbls.org/关于RBL的相关信息。
这个错误有关啊？

ycproc 2012-06-11

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应当是你的邮件服务器配置问题
直接给你一个类吧



using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Net.Mail;

using System.Configuration;



    public class SendMail

    {

        string emailname = ConfigurationManager.AppSettings["emailname"].ToString();

        string emailpwd = ConfigurationManager.AppSettings["emailpwd"].ToString();

        string host = ConfigurationManager.AppSettings["emailhost"].ToString();



        public void SendMailTo(string from, string body)

        {

            try

            {

                //mail服务器设置

                SmtpClient mailserver = new SmtpClient();

                mailserver.Host = host;

                mailserver.Credentials = new System.Net.NetworkCredential(emailname, emailpwd);

                mailserver.Timeout = 5000;

                mailserver.EnableSsl = true;

                //mail邮件设置

                MailMessage mail = new MailMessage();

                MailAddress mfrom = new MailAddress(emailname);

                mail.From = mfrom;

                mail.To.Add(from);

                mail.Subject = "";

                mail.SubjectEncoding = System.Text.Encoding.GetEncoding("GB2312");

                mail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");

                mail.IsBodyHtml = true;

                mail.Body = "";

                mailserver.Send(mail);

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

    }