asp.net发送邮件的方式不少，我经常用这样两种：
一，System.Web.Mail 和System.Web.Util
public static void SendMail(string from , string to, string subject, string body)
{
MailMessage email = new MailMessage(); email.From = from; email.To = to; email.Subject = subject; email.Body = body; SmtpMail.Send(email); 
}public static void CDOsendmail(string from, string to, string subject, string body, string userName, string password, string smtpServer) { CDO.Message Msg = new CDO.Message(); Msg.From = from; Msg.To = to; Msg.Subject = subject; Msg.HTMLBody = "<html><body>"+body +"</body></html>"; CDO.IConfiguration Config = Msg.Configuration; ADODB.Fields oFields = Config.Fields; oFields["http://schemas.microsoft.com/cdo/configuration/sendusing"].Value = 2; oFields["http://schemas.microsoft.com/cdo/configuration/sendusername"].Value=userName; oFields["http://schemas.microsoft.com/cdo/configuration/sendpassword"].Value=password; oFields["http://schemas.microsoft.com/cdo/configuration/smtpauthenticate"].Value=1; oFields["http://schemas.microsoft.com/cdo/configuration/languagecode"].Value=0x0804; oFields["http://schemas.microsoft.com/cdo/configuration/smtpserver"].Value=smtpServer; oFields.Update(); Msg.BodyPart.Charset = "gb2312"; Msg.HTMLBodyPart.Charset = "gb2312"; Msg.Send(); Msg = null; }两种方式的成功率差距很大，后者很高
