c#利用qq的smtp服务器发邮件

首先到qq邮箱的设置->账号->POP3/IMAP/SMTP/EXCHANGE服务，开启服务POP3/SMTP服务。

然后代码中使用即可

using System.Net.Mail;

private void sendmail()

{

MailMessage mm = new MailMessage("sender@qq.com", "receiver@163.com");

mm.To.Add("sender@qq.com");

mm.Subject = "监控出错";

mm.Body = "message";

SmtpClient sc = new SmtpClient("smtp.qq.com");

sc.Credentials = new NetworkCredential("sender", "sender password");

sc.Send(mm);

}