WinForm窗体代码如下：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;//要添加的引用如下using System.Net.Mail;using System.Net.Mime;using System.Timers;using System.IO;namespace NovelCS {    public partial class Form3 : Form {        public Form3() {            InitializeComponent();        }                   private void Form3_Load(object sender, EventArgs e) {            //一些常见的发送邮件服务器地址 一般都是 stmp.**.com   **=qq 或 126 或163 或 gmail 有例外的，具体问度娘            string senderServerIp = "smtp.qq.com";                       string toMailAddress = "1449740504@qq.com";            string fromMailAddress = "1449740504@qq.com";            string subjectInfo = "My First Email";            string bodyInfo =@"Hello Jackerson, \r\n                                        This is my first testing e_mail.But what all thess is from  an author named Eric Sun.                                        Thank you,Eric Sun.";            string mailUsername = "1449740504";            string mailPassword = "******"; //发送人邮箱的密码            string mailPort = "25";   //邮箱端口号            string attachPath = "D:\\jsj.txt; D:\\jsj2.txt";//附件本地地址            MyEmail email = new MyEmail(senderServerIp, toMailAddress, fromMailAddress, subjectInfo, bodyInfo, mailUsername, mailPassword, mailPort, false, false);            email.AddAttachments(attachPath);            email.Send();        }                   }    public class MyEmail {        private MailMessage me;//主要处理发送邮件的内容，例：收发件人地址、标题、主体、图片        private SmtpClient sc;   //主要处理用smtp发送邮件的配置信息，例：发送邮件服务器地址、发送端口号、验证方式        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 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 string mSenderPassword;             //发件箱的密码        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        ///
        /// 构造函数        ///
        ///发件箱的邮件服务器地址        ///收件人地址（可以是多个收件人，程序中是以“;"进行区分的）        ///发件人地址        ///邮件标题        ///邮件内容（可以以html格式进行设计）        ///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）        ///发件人邮箱密码        ///发送邮件所用的端口号（htmp协议默认为25）        ///true表示对邮件内容进行socket层加密传输，false表示不加密        ///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        public MyEmail(string server, string toMailAddress, string fromMailAddress, string emailTitle, string emailBody, string username, string password, string port, bool sslEnable, bool pwdCheckEnable) {            try {                me = new MailMessage();                me.To.Add(toMailAddress);                me.From = new MailAddress(fromMailAddress);                me.Subject = emailTitle;                me.Body = emailBody;                me.IsBodyHtml = true;                me.BodyEncoding = System.Text.Encoding.UTF8;                me.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) {                MessageBox.Show(ex.ToString());            }        }        ///
        /// 添加附件        ///
        ///附件的路径集合，以分号分隔        public void AddAttachments(string attachmentsPath) {            try {                string[] path = attachmentsPath.Split(';'); //以什么符号分隔可以自定义                Attachment data;                ContentDisposition disposition;                for (int i = 0; i < path.Length; i++) {                    data = new Attachment(path[i], MediaTypeNames.Application.Octet);                    disposition = data.ContentDisposition;                    disposition.CreationDate = File.GetCreationTime(path[i]);                    disposition.ModificationDate = File.GetLastWriteTime(path[i]);                    disposition.ReadDate = File.GetLastAccessTime(path[i]);                    me.Attachments.Add(data);                }            } catch (Exception ex) {                MessageBox.Show(ex.ToString());            }        }        ///
        /// 邮件的发送        ///
        public void Send() {            try {                if (me != null) {                    sc = new SmtpClient();                    //mSmtpClient.Host = "smtp." + mMailMessage.From.Host;                    sc.Host = this.mSenderServerHost;                    sc.Port = this.mSenderPort;                    sc.UseDefaultCredentials = false;                    sc.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                        sc.Credentials = nc.GetCredential(sc.Host, sc.Port, "NTLM");                    } else {                        sc.Credentials = new System.Net.NetworkCredential(this.mSenderUserName, this.mSenderPassword);                    }                    sc.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;                    sc.Send(me);                }            } catch (Exception ex) {                Console.WriteLine(ex.ToString());            }        }    }            }

备注：

(1)经过测试，确实可以使用。

(2)本文出处：Eric Sun()

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