连接尝试失败，因为连接方在一段时间后没有正确响应，或者建立的连接失败，因为连接的主机无法响应173.194.79.109:25

问题描述

protected void Button1_Click(object sender, EventArgs e)
        {
            MailMessage mail = new MailMessage();
            mail.To.Add("[e-mail]");
            mail.From = new MailAddress("[e-mail]");
            mail.Subject = "Test Mail";
            mail.Body = "This is a test mail....from gmail acc";
            mail.IsBodyHtml = true;

            ////Attach file using FileUpload Control and put the file in memory stream
            //if (FileUpload1.HasFile)
            //{
            //    mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));
            //}

            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
            smtp.Credentials = new System.Net.NetworkCredential("YourGmailID", "YourGmailPassword"); //Or your Smtp Email ID and Password
            smtp.EnableSsl = true;
            smtp.Port = 25; //If not work, you can use 25 here....
            smtp.Send(mail);
        }

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