SmtpClient 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败

[zhengrong822]

最近邮件发送总是提示发送失败，错误提示如下图：

代码如下：

/// <summary>  
        /// 处审核后类的实例  
        /// </summary>  
        /// <param name="To">收件人地址[di zhi]</param>  
        /// <param name="From">发件人地址[di zhi]</param>  
        /// <param name="Body">邮件[you jian]正文[zheng wen]</param>  
        /// <param name="Title">邮件[you jian]的主题</param>  
        /// <param name="Password">发件人密码[mi ma]</param>  
        public SendMailAction(string To, string From, string Body, string Title, string Password, int port, string host)
        {
            mailMessage = new MailMessage();
            mailMessage.To.Add(To);
            mailMessage.From = new System.Net.Mail.MailAddress(From);
            mailMessage.Subject = Title;
            mailMessage.SubjectEncoding = Encoding.UTF8;
            mailMessage.Body = Body;
            mailMessage.IsBodyHtml = true;
            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
            mailMessage.Priority = System.Net.Mail.MailPriority.Normal;
            this.password = Password;
            this.port = port;
            this.host = host;
        }

        /// <summary>  
        /// 发送邮件[you jian]  
        /// </summary>  
        public void Send()
        {
            if (mailMessage != null)
            {
                smtpClient = new SmtpClient();
                smtpClient.UseDefaultCredentials = false;
                smtpClient.Credentials = new System.Net.NetworkCredential(mailMessage.From.Address, password);//设置[she zhi]发件人身份[shen fen]的票据  
                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtpClient.Host = this.host;
                smtpClient.Port = this.port;
                smtpClient.EnableSsl = true;
                //smtpClient.Timeout = 180000;
                //smtpClient.SendCompleted += new SendCompletedEventHandler(CompletedMethod);//注册[zhu ce]异步[yi bu]发送邮件[you jian]完成时的事件[shi jian]  
                //smtpClient.SendAsync(mailMessage, mailMessage.Body);

                smtpClient.Send(mailMessage);
            }
        }

[zhengrong822]

引用 1 楼 shingoscar 的回复:

就是服务器连不上的意思

之前一直可以发送的 只是过完年后 就不行，不知道是不是本地的原因

[Poopaye]

就是服务器连不上的意思

[Justin-Liu]

看看地址还能访问吗？