無法通過ASP.NET發送電子郵件給客戶端

Question

我製作了一個測試頁面，其中包含一個電子郵件地址文本框，一個提交按鈕和一個錯誤標籤。

下面是C＃代碼，我在這裏看到的論壇：

try 
{ 
    MailMessage mail = new MailMessage("danielohayon2014@gmail.com", (string)txtEmail.Text); 
    SmtpClient client = new SmtpClient(); 
    client.Port = 25; 
    client.DeliveryMethod = SmtpDeliveryMethod.Network; 
    client.UseDefaultCredentials = false; 
    client.Host = "smtp.google.com"; 
    mail.Subject = "this is a test email."; 
    mail.Body = "this is my test email body"; 
    client.Send(mail); 

    lblError.Text = "Message sent!"; 
} 
catch (Exception ex) 
{ 
    lblError.Text = ex.ToString(); 
} 

完整的錯誤它告訴我的是：

System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: The remote name could not be resolved: 'smtp.google.com' at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6) at System.Net.PooledStream.Activate(Object owningObject, Boolean async, 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 email.btnSend_Click(Object sender, EventArgs e) in d:\WebDev\Test\email.aspx.cs:line 28

但它不是爲我工作，我don`不知道該怎麼幫助我！

Answer 1

您可以通過添加此

<system.net> 
    <mailSettings> 
     <smtp deliveryMethod="Network" from="no-reply@yourdomain.com"> 
       <network host="smtp.host.net" userName="yourUsername" password="yourPassword" port="587" enableSsl="true" /> 
     </smtp> 
    </mailSettings> 
</system.net> 

設置的所有SMTP客戶端的憑據在web.config然後你的代碼發送電子郵件變得更簡單

try 
{ 
    using (var client = new SmtpClient()) 
    { 
     MailMessage mail = new MailMessage("MyEmail@gmail.com", (string)txtEmail.Text); 
     mail.Subject = "this is a test email."; 
     mail.Body = "this is my test email body"; 
     client.Send(mail); 
    } 

    lblError.Text = "Message sent!"; 
} 
catch (Exception ex) 
{ 
    lblError.Text = ex.ToString(); 
} 

Answer 2

你的主機名和端口是不正確 - Gmail使用smtp.gmail.com不smtp.google.com和端口587不是25

你的代碼也沒有提供任何的網絡憑據。您已將UseDefaultCredentials正確設置爲false，但您還需要提供新的NetworkCredentials。

client.UseDefaultCredentials = false; 
client.Credentials = new System.Net.NetworkCredential("yourusername", "yourpassword"); 

您還需要啓用SSL：

client.EnableSsl = true;