错误:找不到SMTP主机 [英] error : The SMTP host was not found

问题描述

我正在使用以下代码通过gmail从c#发送邮件，但出现了错误:
不是SMTP主机".
请帮帮我..

static bool mailSent = false;


 public void SendMail()
        {
            //Builed The MSG
            System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
            msg.To.Add("[e-mail]");
            msg.To.Add("[e-mail]");
            msg.From = new MailAddress("[e-mail]");
            msg.Subject = "Test mail using .net2.0";
            msg.SubjectEncoding = System.Text.Encoding.UTF8;
            msg.Body = "This is my msg Body";
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.IsBodyHtml = false;
            msg.Priority = MailPriority.High;            
           
            //Add the Creddentials
            SmtpClient client = new SmtpClient();
            client.Credentials = new System.Net.NetworkCredential
                ("[e-mail]", "*******");
            client.Port = 587;//or use 587            
            client.Host = "smtp.gmail.com";
            client.EnableSsl = true;
            client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);                
            object userState=msg;
            try
            {
                //you can also call client.Send(msg)
                client.SendAsync(msg, userState);   // i am gettint error in this line........             
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                MessageBox.Show(ex.Message, "Send Mail Error");
            }
        }

      void client_SendCompleted(object sender, AsyncCompletedEventArgs e)
       {
           MailMessage mail = (MailMessage)e.UserState;
           string subject = mail.Subject;

           if (e.Cancelled)
           {
               string cancelled = string.Format("[{0}] Send canceled.", subject);
               MessageBox.Show(cancelled);
           }
           if (e.Error != null)
           {
               string error = String.Format("[{0}] {1}", subject, e.Error.ToString());
               MessageBox.Show(error);
           }
           else
           {
               MessageBox.Show("Message sent.");
           }
           mailSent = true;
       }

解决方案

提示在错误消息中.连接到SMTP服务器时出现问题，请检查您的连接设置

添加此行代码

client.UseDefaultCredentials = false;

在您的
之前

<pre lang="midl">client.Credentials = new System.Net.NetworkCredential
                ("[e-mail]", "*******");

看看这个技巧: ^ ]

I am using the below code for sending mail from c# using gmail but I got the error:
"The SMTP host was not".
Please help me..

static bool mailSent = false;


 public void SendMail()
        {
            //Builed The MSG
            System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
            msg.To.Add("[e-mail]");
            msg.To.Add("[e-mail]");
            msg.From = new MailAddress("[e-mail]");
            msg.Subject = "Test mail using .net2.0";
            msg.SubjectEncoding = System.Text.Encoding.UTF8;
            msg.Body = "This is my msg Body";
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.IsBodyHtml = false;
            msg.Priority = MailPriority.High;            
           
            //Add the Creddentials
            SmtpClient client = new SmtpClient();
            client.Credentials = new System.Net.NetworkCredential
                ("[e-mail]", "*******");
            client.Port = 587;//or use 587            
            client.Host = "smtp.gmail.com";
            client.EnableSsl = true;
            client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);                
            object userState=msg;
            try
            {
                //you can also call client.Send(msg)
                client.SendAsync(msg, userState);   // i am gettint error in this line........             
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                MessageBox.Show(ex.Message, "Send Mail Error");
            }
        }

      void client_SendCompleted(object sender, AsyncCompletedEventArgs e)
       {
           MailMessage mail = (MailMessage)e.UserState;
           string subject = mail.Subject;

           if (e.Cancelled)
           {
               string cancelled = string.Format("[{0}] Send canceled.", subject);
               MessageBox.Show(cancelled);
           }
           if (e.Error != null)
           {
               string error = String.Format("[{0}] {1}", subject, e.Error.ToString());
               MessageBox.Show(error);
           }
           else
           {
               MessageBox.Show("Message sent.");
           }
           mailSent = true;
       }

解决方案

The clue is in the error message.. there is a problem connecting to the SMTP Server, check your connection settings

Add this line of code

client.UseDefaultCredentials = false;

before your

<pre lang="midl">client.Credentials = new System.Net.NetworkCredential
                ("[e-mail]", "*******");

Have a look at this tip: Sending an Email in C# with or without attachments: generic routine.[^]

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