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);
}