public class MyEmail    {        private MailMessage mMailMessage;   //主要处理发送邮件的内容（如：收发人地址、标题、主体、图片等等）        private SmtpClient mSmtpClient; //主要处理用smtp方式发送此邮件的配置信息（如：邮件服务器、发送端口号、验证方式等等）        private int mSenderPort;   //发送邮件所用的端口号（htmp协议默认为25）        private string mSenderServerHost;    //发件箱的邮件服务器地址（IP形式或字符串形式均可）        private string mSenderPassword;    //发件箱的密码        private string mSenderUsername;   //发件箱的用户名（即@符号前面的字符串，例如：hello@163.com，用户名为：hello）        private bool mEnableSsl;    //是否对邮件内容进行socket层加密传输        private bool mEnablePwdAuthentication;  //是否对发件人邮箱进行密码验证        ///<summary>        /// 构造函数        ///</summary>        ///<param name="server">发件箱的邮件服务器地址</param>        ///<param name="toMail">收件人地址（可以是多个收件人，程序中是以“;"进行区分的）</param>        ///<param name="fromMail">发件人地址</param>        ///<param name="subject">邮件标题</param>        ///<param name="emailBody">邮件内容（可以以html格式进行设计）</param>        ///<param name="username">发件箱的用户名（即@符号前面的字符串，例如：hello@163.com，用户名为：hello）</param>        ///<param name="password">发件人邮箱密码</param>        ///<param name="port">发送邮件所用的端口号（htmp协议默认为25）</param>        ///<param name="sslEnable">true表示对邮件内容进行socket层加密传输，false表示不加密</param>        ///<param name="pwdCheckEnable">true表示对发件人邮箱进行密码验证，false表示不对发件人邮箱进行密码验证</param>        public MyEmail(string server, string toMail, string fromMail, string subject, string emailBody, string username, string password, string port, bool sslEnable, bool pwdCheckEnable)        {            try            {                mMailMessage = new MailMessage();                mMailMessage.To.Add(toMail);                mMailMessage.From = new MailAddress(fromMail);                mMailMessage.Subject = subject;                mMailMessage.Body = emailBody;                mMailMessage.IsBodyHtml = true;                mMailMessage.BodyEncoding = System.Text.Encoding.UTF8;                mMailMessage.Priority = MailPriority.Normal;                this.mSenderServerHost = server;                this.mSenderUsername = username;                this.mSenderPassword = password;                this.mSenderPort = Convert.ToInt32(port);                this.mEnableSsl = sslEnable;                this.mEnablePwdAuthentication = pwdCheckEnable;            }            catch (Exception ex)            {                Console.WriteLine(ex.ToString());            }        }        public void Send()        {            try            {                if (mMailMessage != null)                {                    mSmtpClient = new SmtpClient();                    //mSmtpClient.Host = "smtp." + mMailMessage.From.Host;                    mSmtpClient.Host = this.mSenderServerHost;                    mSmtpClient.Port = this.mSenderPort;                    mSmtpClient.UseDefaultCredentials = false;                    mSmtpClient.EnableSsl = this.mEnableSsl;                    if (this.mEnablePwdAuthentication)                    {                        System.Net.NetworkCredential nc = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);                        //mSmtpClient.Credentials = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);                        //NTLM: Secure Password Authentication in Microsoft Outlook Express                        mSmtpClient.Credentials = nc.GetCredential(mSmtpClient.Host, mSmtpClient.Port, "NTLM");                    }                    else                    {                        mSmtpClient.Credentials = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);                    }                    mSmtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;                    mSmtpClient.Send(mMailMessage);                }            }            catch (Exception ex)            {                //m_CreateErrorLogTxt("程序池(Email)通知", "邮件发送失败", ex.Message);            }        }    }

转自：http://www.cnblogs.com/mingmingruyuedlut/archive/2011/10/14/2212255.html

        /// <summary>        /// 发送邮件通知        /// </summary>        /// <param name="subjectInfo">标题</param>        /// <param name="bodyInfo">内容</param>        public static void Email(string subjectInfo, string bodyInfo)        {            try            {                var appSettings = System.Configuration.ConfigurationManager.AppSettings;//获取config配置信息                               string senderServerIp = "mail.zbian.cn";                string toMailAddress = appSettings["toMailAddress"];//接受方地址                string fromMailAddress = appSettings["fromMailAddress"];//发送方地址                string mailUsername = appSettings["mailUsername"]; //发送账户                string mailPassword = appSettings["mailPassword"]; //发送邮箱的密码                string mailPort = "25";                MyEmail email = new MyEmail(senderServerIp, toMailAddress, fromMailAddress, subjectInfo, bodyInfo, mailUsername, mailPassword, mailPort, false, false);                email.Send();            }            catch (Exception ex)            {            }        }

    ///添加config配置信息    Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);    config.AppSettings.Settings.Add("IsFirstInstall", "true");         config.Save(ConfigurationSaveMode.Modified);               ConfigurationManager.RefreshSection("appSettings");    ///获取config配置信息    var appSettings = System.Configuration.ConfigurationManager.AppSettings;