SmtpClient smtpClient = new SmtpClient();            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式            smtpClient.Host = "";//指定SMTP服务器            smtpClient.Credentials = new NetworkCredential("", "");//用户名和密码            smtpClient.EnableSsl = true;            MailAddress fromAddress = new MailAddress("fromMail", "nickName");            MailAddress toAddress = new MailAddress("toMail");            MailMessage mailMessage = new MailMessage(fromAddress, toAddress);            mailMessage.Subject = "";//主题            mailMessage.Body = "";//内容            mailMessage.BodyEncoding = Encoding.Default;//正文编码            mailMessage.IsBodyHtml = true;//设置为HTML格式            mailMessage.Priority = MailPriority.Normal;//优先级            smtpClient.SendMailAsync(mailMessage);