.net 制作能发送EMail

用MSDN查一下system.net.mail类（.NET 2.0）。
下面是个工具代码
引用System.Net.Mail;命名空间
  /// <summary>
        /// 发送E-mail
        /// </summary>
        /// <param name="TO">收件人（仅支持单个收件人）</param>
        /// <param name="subject">邮件主题</param>
        /// <param name="body">邮件内容，支持 HTML</param>
        public static bool SendMail(string TO, string subject, string body, bool isHtml)
        {
            string[] batchTo = TO.Split(';');
            foreach (var to in batchTo)
            {
                MailMessage mail = new MailMessage("[email protected]", to);
                mail.From = new MailAddress(ConfigurationManager.AppSettings["SmtpSender"],
                                        ConfigurationManager.AppSettings["DisplayName"]);
                mail.Subject = subject;
                mail.Body = body;
                mail.IsBodyHtml = isHtml;
                SmtpClient smtp = new SmtpClient();
                smtp.Host = ConfigurationManager.AppSettings["SmtpServer"];
                smtp.Port = int.Parse(ConfigurationManager.AppSettings["SmtpPort"]);
                System.Net.NetworkCredential credential = new System.Net.NetworkCredential();
                credential.UserName = ConfigurationManager.AppSettings["SmtpUsername"];
                credential.Password = ConfigurationManager.AppSettings["SmtpPin"];
                smtp.Credentials = credential;
                try
                {
                    smtp.Send(mail);
                    if (batchTo.Length == 1)
                        return true;
                }
                catch (SmtpException)
                {
                    if (batchTo.Length == 1)
                        return false;
                }
            }            return true;
        }

using System.Web.Mail;
using System.Net;
public void Fyj()//用户注册完可以调用这个发邮件方法
    {        try
        {
            MailMessage Mail = new MailMessage();
            Mail.From = "[email protected]";//你要发邮件地址
            Mail.To = "[email protected]";//目标地址（要发的用户邮箱地址）
            Mail.Subject = "测试发送邮件!";//邮件标题
            Mail.Body = "哈哈测试下";   //邮件内容
            Mail.BodyFormat = MailFormat.Html;
            Mail.Priority = MailPriority.High;
            Mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
Mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "你的用户名");//用户名
       Mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "你的邮箱密码");//密码
            System.Web.Mail.SmtpMail.SmtpServer = "smtp.163.com";
            System.Web.Mail.SmtpMail.Send(Mail);
            Response.Write("<script>alert('发送成功!')</script>");
        }
        catch (Exception exp)
        {
            Response.Write(exp.Message);
        }
    }

先在bin目录里添加引用jmail.dll，然后注册一下，用regsvr32 路径\jmail.dll命令注册一下，就可以写程序了！
程序如下：
jmail.Message jmessage=new jmail.MessageClass();
jmessage.Charset="GB2312";//编码
jmessage.From="[email protected]";//发送人的邮件地址
jmessage.FromName= "系统管理员" ;//发送人的姓名
//jmessage.ReplyTo="[email protected]";//回复时的地址
jmessage.Subject="你的密码！";//邮件主题
jmessage.AddRecipient(email ,"","");//接收人的邮件地址，姓名
jmessage.Body= "你在本网站的帐号密码已经成功找回，请你妥善保管！卡号："+cardid+"密码："+cardpassword ;//邮件内容
jmessage.MailServerUserName= "flcandclf" ;//发送者邮箱的用户名
jmessage.MailServerPassWord= "flc198068" ;//发送者邮箱的密码
jmessage.Send("smtp.sohu.com",false) ;//发送着邮箱的smtp服务器地址
Response.Write("<script language='javascript'>alert('密码已成功发送到指定邮箱，请查收！');</script>");
jmessage.Close() ;

http://www.cnblogs.com/doymoneya/articles/645645.html
看看这个

我听说.net里面的using System.Web.Mail;
装了防火墙就不好用了。

protected void View3_Activate(object sender, EventArgs e)
    {
        ////设置发件人信箱,及显示名字
        MailAddress from = new MailAddress("[email protected]", "J.L.C");
        //设置收件人信箱,及显示名字
        MailAddress to = new MailAddress(model.Email, model.LoginName);
        //创建一个MailMessage对象
        MailMessage oMail = new MailMessage(from, to);        oMail.Subject = "购物网";      //邮件标题
        oMail.Body = "你的恢复密码是" + model.LoginName;         //邮件内容        oMail.IsBodyHtml = true;            //指定邮件格式,支持HTML格式
        oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件采用的编码
        oMail.Priority = MailPriority.High;//设置邮件的优先级为高        //发送邮件服务器
        SmtpClient client = new SmtpClient();
        client.Host = "smtp.163.com";    //指定邮件服务器
        client.Credentials = new NetworkCredential("[email protected]", "*****");//指定服务器邮件,及密码        //发送
        try
        {
            client.Send(oMail);  //发送邮件
            lbEmail.Text = "恭喜你！邮件发送成功。";        }
        catch
        {
            lbEmail.Text = "邮件发送失败，检查网络及信箱是否可用。";
        }        oMail.Dispose();        //释放资源
    }

用System.Net.Mail发送就可以了，详细请看MSDN。

可以用JMAIL，也可用Mail
参考
http://www.cnblogs.com/jailu/archive/2007/04/10/707036.htmlhttp://www.cnblogs.com/mac-j/archive/2008/08/08/1263705.html

http://topic.csdn.net/u/20080301/17/18568a4c-0c34-4bad-b0c5-08bc16a297ef.html

1 System.Net.Mail
2 jmail

using System.Net.Mail;试了很多SMTP发送邮件的代码，结果相同。代码：
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading;
using System.ComponentModel; namespace 测试
{              //smtp类
    class Class1
    {
        static bool mailSent = false;
        public static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
        {
            // Get the unique identifier for this asynchronous operation.
            String token = (string)e.UserState;             if (e.Cancelled)
            {
                Console.WriteLine("[{0}] Send canceled.", token);
            }
            if (e.Error != null)
            {
                Console.WriteLine("[{0}] {1}", token, e.Error.ToString());
            }
            else
            {
                Console.WriteLine("Message sent.");
            }
            mailSent = true;
        }
        public static void Main(string[] args)
        {
            string svr = "mail.lierda.com";
            // Command line argument must the the SMTP host.
            SmtpClient client = new SmtpClient(svr, 25);             // Specify the e-mail sender.
            // Create a mailing address that includes a UTF8 character
            // in the display name.
            MailAddress from = new MailAddress("[email protected]");
              // "yuxiaozhong" + (char)0xD8 + "4821698",System.Text.Encoding.UTF8);
            // Set destinations for the e-mail message.
            MailAddress to = new MailAddress("[email protected]");
            // Specify the message content.
            MailMessage message = new MailMessage(from, to);
            message.Body = "This is a test e-mail message sent by an application. ";
            // Include some non-ASCII characters in body and subject.
            string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192', '\u2193' });
            message.Body += Environment.NewLine + someArrows;
            message.BodyEncoding = System.Text.Encoding.UTF8;
            message.Subject = "test message 1" + someArrows;
            message.SubjectEncoding = System.Text.Encoding.UTF8;
            // Set the method that is called back when the send operation ends.
            client.SendCompleted += new  SendCompletedEventHandler(SendCompletedCallback);
            // The userState can be any object that allows your callback
            // method to identify this send operation.
            // For this example, the userToken is a string constant.
            string userState = "test message1";
            client.Credentials = new System.Net.NetworkCredential(from.Address, "11181118", "lierda.com");//
            client.SendAsync(message, userState);
            Console.WriteLine("Sending message... press c to cancel mail. Press any other key to exit.");             string answer = Console.ReadLine();             // If the user canceled the send, and mail hasn't been sent yet,
            // then cancel the pending operation.
            //client.SendAsyncCancel();
            if (answer.StartsWith("c") && mailSent == false)
            {
                client.SendAsyncCancel();
            }
            // Clean up.
            message.Dispose();
            Console.WriteLine("Goodbye.");
        }
    }
}

调试易

.net 制作能发送EMail

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