#region 發(fā)送郵件：此方法失敗 
protected void SendFailed() 
{ 
System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage(); 
mail.From = "test@ gmail.com"; 
mail.To = " test@ gmail.com "; 
mail.Subject = "For Test"; 
mail.Priority = System.Web.Mail.MailPriority.Normal; 
mail.BodyEncoding = Encoding.Default; 
mail.BodyFormat = MailFormat.Html; 
mail.Body = "this is a Email!<input type='button' value='ok'/>"; 
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication 
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "test"); //set your username here 
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "****"); //set your password here 
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserver", "smtp.gmail.com"); 
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", "587"); 
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true"); 
SmtpMail.SmtpServer = "smtp.gmail.com"; 
SmtpMail.Send(mail); 
} 
#endregion

方法二：使用System.Net.Mail命名空間（此方法測試成功）
我使用的gmail的郵箱，以及他提供免費smtp服務，之前試了好幾個郵箱都不成功。Gmail的smtp服務必須經(jīng)過ssl加密，才可以驗證成功。

復制代碼代碼如下:

#region 發(fā)送郵件：此方法可行 
protected void SendSuccess() 
{ 
System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage(); 
message.From = new MailAddress("test@gmail.com", "someone");//必須是提供smtp服務的郵件服務器 
message.To.Add(new MailAddress("test@yahoo.com.cn")); 
message.Subject = "測試郵件" ; 
message.CC.Add(new MailAddress("test@126.com")); 
message.Bcc.Add(new MailAddress("test@126.com")); 
message.IsBodyHtml = true; 
message.BodyEncoding = System.Text.Encoding.UTF8; 
message.Body = "郵件發(fā)送測試"; 
message.Priority = System.Net.Mail.MailPriority.High; 
SmtpClient client = new SmtpClient("smtp.gmail.com", 587); // 587;//Gmail使用的端口 
client.Credentials = new System.Net.NetworkCredential("test@gmail.com", "password"); //這里是申請的郵箱和密碼 
client.EnableSsl = true; //必須經(jīng)過ssl加密 
try 
{ 
client.Send(message); 
Response.Write("郵件已經(jīng)成功發(fā)送到" + message.To.ToString() + "<br>"); 
} 
catch (Exception ee) 
{ 
Response.Write(ee.Message + "<br>" /* + ee.InnerException.Message*/ ); 
} 
} 
#endregion 

郵件接收
我使用的是LumiSoft.Net這個開源的項目，也是從一個網(wǎng)友哪里看到的下載地址，然后自己看了下代碼，寫了個簡單的接收方法。首先將代碼中relrease目錄下的dll文件引用到項目中。

復制代碼代碼如下:

using LumiSoft.Net.POP3.Client; 
using LumiSoft.Net.Mail; 
…… 
public IList<Mail_Message> ReceiveMail() 
{ 
IList<Mail_Message> mailList = new List<Mail_Message>(); 
using (POP3_Client client = new POP3_Client()) 
{ 
client.Connect("pop.gmail.com",995,true); 
client.Authenticate("zw.seaman", "zw_seaman", false); 
POP3_ClientMessageCollection coll = client.Messages; 
for (int i = 0; i < coll.Count; i++) 
{ 
POP3_ClientMessage message = coll[i]; 
Mail_Message mm = Mail_Message.ParseFromByte(coll[i].MessageToByte()); 
mailList.Add(mm); 
} 
} 
return mailList; 
} 
protected void Page_Load(object sender, EventArgs e) 
{ 
IList<Mail_Message> mailList = new ZMail.Mail().ReceiveMail(); 
foreach (Mail_Message mail in mailList) 
{ 
StringBuilder sb = new StringBuilder(); 
sb.Append(mail.From.ToString()).Append("&nbsp;&nbsp;發(fā)送給&nbsp;&nbsp;"); 
sb.Append(mail.To.ToString()).Append("<br/>") ; 
sb.Append(mail.Subject).Append("<br/>"); 
sb.Append(mail.BodyHtmlText).Append("<hr/>"); 
Response.Write(sb.ToString()); 
} 
}