实现Email传送

using System.Web.Mail;
using System.IO;

        private void btnSend_Click(object sender, System.EventArgs e)
        {
            //分别取得邮件的收信人的地址、发信人的地址、抄送、主题、内容等信息
            string strTo        = tbTo.Text;
            string strFrom        = tbFrom.Text;
            string strPwd        = tbPwd.Text;
            string strCopyTo    = tbCopyTo.Text;
            string strSubject    = tbSubject.Text;
            string strBody        = tbBody.Text;

            try
            {
                MailMessage ms=new MailMessage();

                ms.To            = strTo;            //收信人的地址
                ms.From            = strFrom;            //发信人的地址
                ms.Cc            = strCopyTo;        //抄送
                ms.Subject        = strSubject;        //主题
                ms.BodyFormat    = MailFormat.Html;    //正文格式html/text
                ms.Body            = strBody;            //正文

                string strPathOfAttachFile = "";    //初始化附件
                //如果有附件则上传
                HttpPostedFile hpPFile = AttachFile.PostedFile;        //获得上传文件的访问
                if(hpPFile.FileName != "")
                {
                    //有附件，则上传到Temp目录中
                    //判断是否存在Temp目录，若无，则创建
                    string FolderName = Server.MapPath(".") + "\\Temp";
                    if(Directory.Exists(FolderName) == false)
                        Directory.CreateDirectory(FolderName);
                    //取得文件名(不含路径)
                    char[] separator = {'\\'};        //separator的值为"\"
                    string[] AFileName  = hpPFile.FileName.Split(separator);
                    string strFileName  = AFileName[AFileName.Length-1];
                    strPathOfAttachFile    = Server.MapPath(".")+"\\Temp\\"+strFileName;
                    hpPFile.SaveAs(strPathOfAttachFile);
                    //添加附件
                    ms.Attachments.Add(new MailAttachment(strPathOfAttachFile));

                }

                //从发信人的地址计算出邮件服务器
                string[] strTemp = strFrom.Split('@');
                string strPartOfSmtpServer  = strTemp[strTemp.Length-1];
                string strSmtpServer = "smtp." + strPartOfSmtpServer;

                ms.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//value=0 No Check    value=1 Basic Check      Value=2 Exchage Check
                ms.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", strFrom); //发信人的邮箱地址                
                ms.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", strPwd);//验证信息
                SmtpMail.SmtpServer=strSmtpServer;    //邮件服务器ip或域名

                SmtpMail.Send(ms);            //发送    


                //清除控件中的内容
                tbTo.Text        = "";
                tbCopyTo.Text    = "";
                tbSubject.Text    = "";
                tbBody.Text        = "";
                //删除Temp目录中的附件
                if(File.Exists(strPathOfAttachFile) == true)
                    File.Delete(strPathOfAttachFile);


                //确认邮件发送成功
                string strScript = "<script>alert('邮件发送成功！')</script>";
                if (! Page.IsStartupScriptRegistered("Alert"))
                {    
                    Page.RegisterStartupScript("Alert", strScript);
                }

            }
            catch
            {
                string strScript = "<script>alert('邮件发送失败！')</script>";        
                if (! Page.IsStartupScriptRegistered("Alert"))
                {    
                    Page.RegisterStartupScript("Alert", strScript);
                }

            }

        }