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Question

using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;using System.Windows.Forms;namespace Storm2.CommonLib
{
    public delegate void MailEventDelegate(EventArgs e);    public class SendMail
    {
        #region Variable declaration
        private string m_from;
        private string[] m_too;
        private string[] m_cc;
        private string m_subject;
        private string m_body;
        private string[] m_filename;
        private string m_host;
        private string m_user;
        private string m_password;
        #endregion        public delegate bool MethodDelegate();        public event MailEventDelegate MailEvent;        public static bool outFlag;        public SendMail()
        {
        }
        public string From
        {
            get { return m_from; }
            set { m_from = value; }
        }
        public string[] Too
        {
            get { return m_too; }
            set { m_too = value; }
        }
        public string[] Cc
        {
            get { return m_cc; }
            set { m_cc = value; }
        }
        public string Subject
        {
            get { return m_subject; }
            set { m_subject = value; }
        }
        public string Body
        {
            get { return m_body; }
            set { m_body = value; }
        }
        public string[] FileName
        {
            get { return m_filename; }
            set { m_filename = value; }
        }
        public string Host
        {
            get { return m_host; }
            set { m_host = value; }
        }
        public string User
        {
            get { return m_user; }
            set { m_user = value; }
        }
        public string Password
        {
            get { return m_password; }
            set { m_password = value; }
        }
        public bool CreateMessageWithAttachmen()
        {
            if (string.IsNullOrEmpty(m_from.TrimEnd())) return false;            if (m_too == null) return false;            for (int i = 0; i <= m_too.Length - 1; i++)
                if (string.IsNullOrEmpty(m_too[i])) return false;            MailAddress fromAddress = new MailAddress(m_from);
            MailAddress toAddress = new MailAddress(m_too[0]);            MailMessage message = new MailMessage(fromAddress, toAddress);            message.Subject = m_subject;
            message.IsBodyHtml = true;
            message.Body = m_body;
            //To
            if (m_too.Length > 1)
            {
                for (int i = 1; i <= m_too.Length - 1; i++)
                {
                    message.To.Add(m_too[i]);
                }
            }
            //Cc
            if (m_cc != null)
            {
                for (int i = 0; i <= m_cc.Length - 1; i++)
                {
                    if (m_cc[i].Trim() != string.Empty)
                        message.CC.Add(m_cc[i]);
                }
            }
            //Attachmen
            if (m_filename != null)
            {
                for (int i = 0; i <= m_filename.Length - 1; i++)
                {
                    if (!string.IsNullOrEmpty(m_filename[i]))
                    {
                        if (File.Exists(m_filename[i]) == true)
                        {
                            ContentType ct = new ContentType(MediaTypeNames.Application.Octet);                            Attachment data = new Attachment(m_filename[i], ct);                            ContentDisposition disposition = data.ContentDisposition;                            disposition.CreationDate = File.GetCreationTime(m_filename[i]);
                            disposition.ModificationDate = File.GetLastWriteTime(m_filename[i]);
                            disposition.ReadDate = File.GetLastAccessTime(m_filename[i]);
                            message.Attachments.Add(data);
                        }
                        else
                        {
                            //File Not Exist
                            return false;
                        }
                    }
                }
            }            SmtpClient client = new SmtpClient(m_host);            client.Credentials = new NetworkCredential(m_user, m_password);
            client.Send(message);            return true;
        }        private void IsAsyncCompleted(IAsyncResult asyncResult)
        {            if (asyncResult == null) return;            MethodDelegate md = (MethodDelegate)asyncResult.AsyncState;            outFlag = (bool)md.EndInvoke(asyncResult);            RaiseMailEvent(EventArgs.Empty);        }        private void RaiseMailEvent(EventArgs e)
        {
            if (MailEvent != null)
            {
                MailEvent(e);
            }
        }        public void AsyncSendMail()
        {
            MethodDelegate dlgt = new MethodDelegate(this.CreateMessageWithAttachmen);
            IAsyncResult ar = dlgt.BeginInvoke(IsAsyncCompleted, dlgt);
        }    }}

Answer 1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net.Mail;
using System.Net;namespace MailTest
{
     public partial class Form1 : Form
     {
         public static string server;
         public static string name;
         public static string pwd;
         public static string fromer;
        
         public Form1()
         {
             InitializeComponent();
         }
                
         private void Form1_Load(object sender, EventArgs e)
         {         }
        
         private void btnSetting_Click(object sender, EventArgs e)
         {
             Setting set = new Setting();
             set.Show();
         }         private void btnSend_Click(object sender, EventArgs e)
         {
             try
             {
                 MailAddress to = new MailAddress(this.txtTo.Text.Trim());
                 MailAddress from = new MailAddress(fromer);
                 MailMessage msg = new MailMessage(from, to);
                 msg.Subject = txtSubject.Text.Trim();
                 msg.Body = txtBody.Text.Trim();
                 msg.IsBodyHtml = true;
                 SmtpClient smtp = new SmtpClient(server, 25);
                 smtp.Credentials = new NetworkCredential(name, pwd);
                 smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                 smtp.Send(msg);
                 MessageBox.Show("邮件发送成功！");
             }
             catch (Exception ex)
             {
                 MessageBox.Show(ex.Message);
             }
             finally
             {
                 this.txtBody.Text = "";
                 this.txtSubject.Text = "";
                 this.txtTo.Text = "";
             }
         }        
     }
}

Answer 2

 private void Sendmail(string mailto,string body,string title)
        {
            MailMessage m_msg=new MailMessage();
            m_msg.From="张三<[email protected]>";
            m_msg.To=mailto;//收件人
            m_msg.Body=body;//邮件正文
            m_msg.Subject=title;//邮件标题
            m_msg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//是否需要验证，一般是要的
            m_msg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "[email protected]");//自己邮箱的用户名
            m_msg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "abcd");//自己邮箱的password
            SmtpMail.SmtpServer="pop3.163.com";
            try
            {
                SmtpMail.Send(m_msg);
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

Answer 3

   ASP.Net环境下使用Jmail组件发送邮件
   ASP.NET JMail 接收邮件