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ASP.NET发送email,默认是25端口

/// <summary>发送email,默认是25端口
        /// 
        /// </summary>
        /// <param name="title">邮件标题</param>
        /// <param name="body">邮件内容</param>
        /// <param name="toAdress">收件人</param>
        /// <param name="fromAdress">发件人</param>
        /// <param name="userName">发件用户名</param>
        /// <param name="userPwd">发件密码</param>
        /// <param name="smtpHost">smtp地址</param>
        public static void SendMail(string title, string body, string toAdress, string fromAdress,
                              string userName, string userPwd, string smtpHost)
        {
            try
            {
                MailAddress to = new MailAddress(toAdress);
                MailAddress from = new MailAddress(fromAdress);
                System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage(from, to);
                message.IsBodyHtml = true; // 如果不加上这句那发送的邮件内容中有HTML会原样输出 
                message.Subject = title; message.Body = body;
                SmtpClient smtp = new SmtpClient();
                smtp.UseDefaultCredentials = true;
                smtp.Port = 25;
                smtp.Credentials = new NetworkCredential(userName, userPwd);
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.Host = smtpHost;
                message.To.Add(toAdress);
                smtp.Send(message);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

.net异常处理加到Global程序文件中的

  

  protected void Application_Error(object sender, EventArgs e)
        {
          //在出现未处理的错误时运行的代码
            Exception objErr = Server.GetLastError().GetBaseException();
            string time = DateTime.Now.ToString();
            string error = "";
            error += "<strong>异常信息： </strong>" + objErr.Message + "<br>";
            error += "<strong>异常发生时间：</strong>" + time + "<br>";
            error += "<strong>IP： </strong>" + Request.UserHostAddress + "<br>";
            error += "<strong>发生异常页： </strong>" + Request.Url.ToString() + "<br>";
            string url_re = "";
            if (Request.UrlReferrer != null)
            {
                url_re = Request.UrlReferrer.ToString();
            }
            error += "<strong>上次请求的URL： </strong>" + url_re + "<br>";
            error += "<strong>堆栈跟踪： </strong><br>" + objErr.StackTrace.Replace("\r\n", "<br>") + "<br>";


            if (!objErr.Message.Contains("不存在"))
            {
                Xiaobin.Utility.Tool.SendMail("网站出现异常" + time, error, "35754311@qq.com", "181796286@qq.com", "181796286", "123456", "smtp.qq.com");
            }
        }

设置web.config文件  

//On打开错误机制 默认指向Error.html  404错误指向FileNotFound.html

加在system.web节点中

 <customErrors mode="On" defaultRedirect="Error.html">

      <error statusCode="404" redirect="FileNotFound.html"/>

</customErrors>

创建test.aspx测试一下异常处理

 throw new Exception("自定义的异常");