SmtpClient：连接尝试失败，因为连接方在一段时间后未正确响应 [英] SmtpClient: A connection attempt failed because the connected party did not properly respond after a period of time

问题描述

在Visual Studio 2008中使用C＃.NET中的电子邮件发送，我得到以下错误

While working with Email sending in C#.NET in visual studio 2008 i got the below error

连接尝试失败，因为连接一方在一段时间后没有正确响应，或建立连接失败，因为连接的主机未能响应74.125.53.108:25

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 74.125.53.108:25

但同样的代码在一些其他电脑工作正常，但是当我今天测试它给我的错误在 Send（）方法...另外我的网络连接是好的，我在哪里正在测试电子邮件代码..

But the same code was working fine in some other PC but when i am testing today it gives me error in Send() method... Also my network connection is good where i am testing the email code..

以下是我的电子邮件代码

Below is my email code

MailMessage mail = new MailMessage();
mail.To.Add(to);
mail.From = new MailAddress(from);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Credentials = new System.Net.NetworkCredential("[e-mail]",
                                                            "MyPassword");
smtp.EnableSsl = true;
smtp.Send(mail);

可能是这样的错误的原因..

What could be the reasons for such error..???

推荐答案

以下代码适用于我。你的代码给我错误，我相信这是由于没有将端口设置为587.

The following code works for me. Your code was giving me errors, I believe it was due to not setting the port to 587.

http://forums.asp.net/t/1250771.aspx/4/10

MailMessage mail = new MailMessage();
mail.To.Add(to);
mail.From = new MailAddress(from);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com",587);
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential(address, password);
smtp.Send(mail);

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