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Question

發送電子郵件我有這樣的代碼片段發送一封電子郵件，但我每次EXCUTE它的時候，我得到這個例外

等待操作期限屆滿

public static void CreateTimeoutTestMessage(string server) 
    { 
     string to = "touilhaythem1@gmail.com"; 
     string from = "raddaouirami@gmail.com"; 
     string subject = "Using the new SMTP client."; 
     string body = @"Using this new feature, you can send an e-mail message from an application very easily."; 
     MailMessage message = new MailMessage(from, to, subject, body); 
     SmtpClient client = new SmtpClient(server, 587); 
     client.EnableSsl = true; 
     client.Credentials=new NetworkCredential("raddaouirami@gmail.com", "XXXXXXXXX"); 
     Console.WriteLine("Changing time out from {0} to 100.", client.Timeout); 
     client.Timeout = 100; 
     // Credentials are necessary if the server requires the client 
     // to authenticate before it will send e-mail on the client's behalf. 
     //client.Credentials = CredentialCache.DefaultNetworkCredentials; 

     try 
     { 
      client.Send(message); 
     } 
     catch (Exception ex) 
     { 
      Console.WriteLine("Exception caught in CreateTimeoutTestMessage(): {0}", 
        ex.ToString()); 
     } 

     Console.ReadLine(); 
    } 

Answer 1

當然你獲得超時 - 您爲超時指定了100毫秒。這很短。聯繫服務器併發送郵件可能需要超過100ms。嘗試一下10000ms十秒。

我知道它在您複製並粘貼的MSDN sample中，但它太短。這是最好的刪除下列行：

Console.WriteLine("Changing time out from {0} to 100.", client.Timeout); 
client.Timeout = 100; 

---

請試試這個（從here上心）：

... 
    MailMessage message = new MailMessage(from, to, subject, body); 
    SmtpClient client = new SmtpClient(server, 587); 
    client.EnableSsl = true; 
    client.UseDefaultCredentials = false; // <--- NEW 
    client.Credentials = new NetworkCredential("raddaouirami@gmail.com", "XXXXXXXXX"); 

這可能等待身份驗證。

Answer 2

如果您有：

SmtpClient client = new SmtpClient(server, 587); 

把它分解成：

SmtpClient client = new SmtpClient(); 
client.Host = "smtp.gmail.com"; 
client.Port = 587; 

因爲我沒有看到你所定義的服務器，如果你想使用Gmail，你可以只要宣佈它是這樣的主機，看看這是否讓你更接近你的目標。

另外一個方面，Gmail的SMTP不允許你改變發送地址，以防止網絡釣魚，所以如果你打算允許輸入改變變量，它不會工作，Gmail默認爲電子郵件在證書中提供