public MyMailService()
{InitializeComponent();base.AutoLog = false; // 不记录windows事件日志base.ServiceName = "MyMailService";timer1.Stop();
}protected override void OnStart(string[] args)
{timer1.Start();
}protected override void OnStop()
{timer1.Stop();
}

public class Mail
{private string DefaultHost = "smtp.mail.qq.com"; // SMTP服务器，这里是QQ邮箱private string DefaultFMAddress = "396042321@qq.com"; // 邮箱用户名private string DefaultName = "默认发送人";private string DefaultPassword = "XXXXX"; // 邮箱密码private string DefaultSubject = "系统邮件";private MailMessage MMsg;private NetworkCredential NC;public Mail(){MMsg = new MailMessage();MMsg.From = new MailAddress(DefaultFMAddress, DefaultName);MMsg.Subject = DefaultSubject;MMsg.Priority = MailPriority.Normal;MMsg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;NC = new NetworkCredential();NC.UserName = DefaultFMAddress;NC.Password = DefaultPassword;}/// <summary>设置发件人</summary>/// <param name="fmAddress">发件人邮箱</param>/// <param name="fmName">发件人别名</param>public void setFrom(string fmAddress, string fmName){ MMsg.From = new MailAddress(fmAddress, fmName); }/// <summary>添加收件人</summary>/// <param name="toAddress">收件人地址</param>public void AddTo(string toAddress){string[] adds = toAddress.Split(',');foreach (string add in adds)if (!string.IsNullOrEmpty(add))MMsg.To.Add(add);}/// <summary>添加抄送人</summary>/// <param name="ccAddress">抄送人地址</param>public void AddCC(string ccAddress){if (!string.IsNullOrEmpty(ccAddress))MMsg.CC.Add(ccAddress);}/// <summary>邮件主题</summary>public string Subject{ set { MMsg.Subject = value; } }/// <summary>邮件正文</summary>public string Content{set{MMsg.Body = value;MMsg.BodyEncoding = System.Text.Encoding.UTF8;MMsg.IsBodyHtml = true;}}/// <summary>添加附件：文件名UTF8编码不得超过41字节，否则附件无法打开</summary>/// <param name="path">附件的物理路径</param>public void AddAttchment(string path){if (!string.IsNullOrEmpty(path)){string[] atts = path.Split(',');foreach (string att in atts){if (!System.IO.File.Exists(att))throw new Exception("找不到附件：" + att);elseMMsg.Attachments.Add(new Attachment(att));}}}/// <summary>发送级别</summary>public MailPriority Priority{ set { MMsg.Priority = value; } }/// <summary>发送邮件</summary>public void Send(){SmtpClient sc = new SmtpClient();sc.UseDefaultCredentials = true;sc.DeliveryMethod = SmtpDeliveryMethod.Network;sc.Credentials = NC;sc.Host = DefaultHost;sc.Send(MMsg);MMsg.Dispose(); // 发送邮件后释放对象
    }
}

private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{Mail mail = new Mail();mail.AddTo("396042321@qq.com"); // 收件人mail.AddCC("396042321@qq.com"); // 抄送人mail.Subject = "主题";mail.Content = "邮件正文";mail.AddAttchment("C:\test.txt"); // 附件
    mail.Send();
}

C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe CYWinService.exe
pause

C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /u CYWinService.exe
pause

TABLE [dbo].[t_SYS_Mail]([ID] [int] IDENTITY(1,1) NOT NULL,[FmSMTP] [varchar](50) NULL, -- 邮箱SMTP[FmWho] [varchar](50) NULL, -- 发送人邮箱[FmPassword] [varchar](50) NULL, -- 发送人邮箱密码[FmName] [varchar](50) NULL, -- 显示的发送人名称[ToWho] [varchar](100) NOT NULL, -- 收件人[CCWho] [varchar](100) NULL, -- 抄送人[MailSubject] [varchar](100) NOT NULL, -- 主题[MailContent] [varchar](500) NOT NULL, -- 正文[MailPriority] [varchar](50) NULL, -- 优先级[MailAttchments] [varchar](500) NULL, -- 附件[AddTime] [datetime] NULL,[SendTime] [datetime] NULL,[ErrMessage] [varchar](100) NULL)