SMTP服务器没有响应' SmtpClient '连接尝试.我该如何解决这个问题?

我尝试用。net编写发送电子邮件的代码。这是我目前所看到的:

MailMessage mail = new MailMessage("mymailaddress@yahoo.com", address);
mail.Subject = subject;
mail.Body = body;
client.Host = "smtp.gmail.com"; 
client.Port = 587;
client.Send(e);

问题是我得到以下异常:

Unhandled Exception: System.Net.Mail.SmtpException: Failure sending mail.
System.Net.WebException: cannot connect to remote server.
System.Net.Sockets.SocketException: A connection attempt failed because the connected party173.194.66.109:587
在一段时间后没有正常响应，或者连接的主机响应失败导致连接失败

试试这个:

using System.Net;
using System.Net.Mail;  
// ...
MailAddress maFrom = new MailAddress("<address>", "<display_name>");
MailAddress maTo = new MailAddress("<address>", "<display_name>");
const string sPassword = "<password>";
const string sSubject = "<subject>";
const string sBody = "<body>";
new SmtpClient
{
    Host = "smtp.gmail.com",
    Port = 587,
    EnableSsl = true,
    DeliveryMethod = SmtpDeliveryMethod.Network,
    UseDefaultCredentials = false,
    Credentials = new NetworkCredential(maFrom.Address, sPassword)
}.Send(new MailMessage(maFrom, maTo) { Subject = sSubject, Body = sBody });

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