在网上找了很多例子都试邮件发送都失败，今天无意有试了一下居然行了

public static void ErrorMessageMail(string _subject, string _body)
        {
            //创建MailMessage对象
            System.Net.Mail.MailMessage mailMsg = new System.Net.Mail.MailMessage();
            //设置发件人,发件人需要与设置的邮件发送服务器的邮箱一致
            System.Net.Mail.MailAddress fromAddr = new System.Net.Mail.MailAddress("***@qq.com");
            mailMsg.From = fromAddr;
            //设置收件人的邮件地址
            mailMsg.To.Add("***@qq.com");
            //设置发送者的邮件地址
            mailMsg.CC.Add("***@qq.com");
            //设置邮件主题
            mailMsg.Subject = _subject;
            //设置邮件内容
            mailMsg.Body = _body;

　　　//添加附件
            if(!string.IsNullOrEmpty(sfile))
            {
                mailMsg.Attachments.Add(new System.Net.Mail.Attachment(sfile));
            }
            //设置邮件发送服务器,服务器根据你使用的邮箱而不同,可以到相应的 邮箱管理后台查看,下面是QQ的
            System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp.qq.com", 25);
            //设置发送人的邮箱账号和密码
            client.Credentials = new System.Net.NetworkCredential("***@qq.com", "iaulwrftjctxcafb");
            client.EnableSsl = true;
            try
            {
                client.Send(mailMsg);
            }
            catch (Exception ex)
            {

}
        }