c# 发送邮件

 public static void SendMail(string to, string subject, string content)
        {
            content = string.Concat(content, Environment.NewLine, "注： 自动测试功能评估阶段，结果仅供参考。");
            SmtpClient smtp = new System.Net.Mail.SmtpClient();
            smtp.Host = "10.20.80.250";
            smtp.Credentials = new NetworkCredential("liguoqiang@yskj.com", "ligq01");
            //smtp.Send("liguoqiang@yskj.com", to, subject, content);
            MailMessage mail = new MailMessage();
            //mail.Sender = new MailAddress("liguoqiang@yskj.com", "系统运行环境检测", Encoding.UTF8);
            mail.From = new MailAddress("liguoqiang@yskj.com", "系统运行环境检测", Encoding.UTF8);
            //邮件接收人
            mail.To.Add(to);
            mail.Subject = subject;
            mail.SubjectEncoding = Encoding.UTF8;
            mail.Body = content;
            mail.BodyEncoding = Encoding.UTF8;
            mail.IsBodyHtml = true;
            smtp.Send(mail);
        }