在C#中发送邮件的方式有2种，一种是使用webmail方式进行发送，另外一种就是采用netmail发送的方式，在采用这2种方式发送邮件时，如果采用公用的邮件服务器（如126邮件服务器，Sina的邮件服务器）都是需要授权认证才能够发送，如果是采用Gmail的话，还会有每天发送邮件的数量等限制。这2种方式是经过我测试通过了的代码，只需要将邮件的用户名和密码修改成自己的即可，同时也可以修改邮件服务器，改成自己配置的邮件服务器。
bool bState = false;
string strSMTPServer = "";
try
{
strSMTPServer = Convert.ToString(System.Configuration.ConfigurationManager.AppSettings["SMTP"]);
strSMTPServer = strSMTPServer == "" ? "localhost" : strSMTPServer;
string strFromAddr = Convert.ToString(System.Configuration.ConfigurationManager.AppSettings["FromAddress"]);
if (reg.IsMatch(strFromAddr))
{
message.From = strFromAddr;
}
else
{
throw new Exception("The Email Address is wrong,Please reset the Email Address in the web.config file !");
}
string strTemp = "";
foreach (string str in strTo.Split(';'))
{
if (reg.IsMatch(str))
if (!strTemp.Contains(str))
strTemp += str + ";";
}
message.Cc = "";
foreach (string str in strCc.Split(';'))
{
if (reg.IsMatch(str))
if (!message.Cc.Contains(str))
message.Cc += str + ";";
}
message.Subject = strSubject;
message.BodyFormat = System.Web.Mail.MailFormat.Html;
message.Body ="<html><body>UtilMailMessage001"+ strBody+"- success</body></html>" ;
//下面这块是加载附件的方法
MailAttachment attachment1 =new MailAttachment(@"d:\My Documents\test1.doc");
MailAttachment attachment2 =new MailAttachment("d:\\Documents\\test2.doc");
message.Attachments.Add(attachment1);
message.Attachments.Add(attachment2);
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
//这里的邮箱帐号和密码一定要和下面配置文件中设置的邮箱的帐号和密码一致
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "xxxxxxxxx");//邮箱帐号，比如Test11@126.com帐号为：Test11
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "xxxxxxxx");//邮箱密码
//这个是指明邮件服务器的端口，可以不指定
//message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", "25");
foreach (string str in strTemp.Split(';'))
{
if (reg.IsMatch(str))
{
message.To = str;
message.BodyEncoding = System.Text.Encoding.UTF8;
System.Web.Mail.SmtpMail.SmtpServer = strSMTPServer;
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