SMTP服务器异常 [英] SMTP Server Exception

问题描述

以下是我的代码:-

Following is my code:-

string to, sub, mess;
            to = "[e-mail]";
            sub ="Weekly Clinical Quiz";
            mess ="Quiz Title: " + dr["Quiz_Title"].ToString() + "<br>Name: " + txtName.Text + "<br> Email: " + txtEmail.Text + "<br>Clinical Diagnosis: " + txtContent.Text;
            mess = mess + "<br> Occupation : " + txtOccupation.Text + "<br>Institution: " + txtInst.Text;
            //  tel = "99";

            //MailMessage mg = new MailMessage();
            //MailMessage mg = new MailMessage(txtEmail.Text, "[e-mail]");
            MailMessage mg = new MailMessage(txtEmail.Text, dr["Quiz_Email"].ToString());  
            mg.Subject = sub;
            mg.Body = mess;
            mg.IsBodyHtml = true;
            SmtpClient st = new SmtpClient();
            st.EnableSsl = true;
            st.Host = "smtp.secureserver.net";
            st.Port = 25;
            st.Credentials = new System.Net.NetworkCredential("[e-mail]", "hospital");
            st.UseDefaultCredentials = true;
            st.DeliveryMethod = SmtpDeliveryMethod.Network;
            st.Send(mg);

尝试在服务器上运行此程序时，出现以下异常，

When am trying to run this on server,am getting following exception,

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. ua5sm10078511igb.10

我尝试使用不同的端口号(例如457,565)，但对我来说不起作用.

谁能帮我吗?

I tried with the different port numbers like 457,565 but it didnt work out for me.

Can anyone please help me??

推荐答案

使用st.UseDefaultCredentials = true;
st.Credentials将被忽略，并且将使用当前登录的用户凭据.

如果您明确指定凭据，请保留UseDefaultCredential = false

http://msdn.microsoft.com/en-us/library/system. net.mail.smtpclient.usedefaultcredentials [ ^ ]

When you use st.UseDefaultCredentials = true;
st.Credentials will be ignored and currently logged on user credentials will be used.

If you specify Credentials explicitly, leave UseDefaultCredential = false

http://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient.usedefaultcredentials[^]

检查此链接


使用ASP.NET 2.0的简易SMTP邮件 [ ^ ]

Check this link


Easy SMTP Mail Using ASP.NET 2.0[^]

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