Question

我有这段代码发送电子邮件，但每次执行时，我都会收到此异常

等待操作期限已过期

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

当然你会超时 - 你为超时指定了100毫秒。这很短暂。联系服务器并发送邮件可能需要超过100毫秒。尝试像10000毫秒这样的东西十秒钟。

我知道你复制并粘贴的MSDN sample，但它太短了。最好删除以下行：

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

请尝试这个（从here获得想法）：

    ...
    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");

它可能会等待身份验证。

Answer 2

你在哪里：

SmtpClient client = new SmtpClient(server, 587);

将其分解为：

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

因为我不知道您在哪里定义了服务器，并且如果您尝试使用gmail，您可以将其声明为主机，以确定这是否让您更接近目标

另外注意，gmail smtp不允许您更改发送地址，以防止网络钓鱼，因此如果您计划允许输入更改from变量，它将无法正常工作，gmail默认为凭证中提供的电子邮件

通过Google发送电子邮件

2 个答案: