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   源码介绍

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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;
using System.Net.Mail;
using System.Net.Mime;

namespace MyEmail
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();//创建打开文件对话框对象
            if (open.ShowDialog() == DialogResult.OK)
            {
                this.txtAttach.Text = open.FileName.ToString();//获取文件
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (this.richTextBox1.Text.Trim().ToString() != "")
                {
                    string server = this.txtserver.Text;
                    MailMessage Mail = new MailMessage(this.txtFrom.Text, this.txtGet.Text);
                    Mail.Subject = this.txtSubject.Text.Trim().ToString();
                    Mail.Body = this.richTextBox1.Text.Trim().ToString();
                    SmtpClient Client = new SmtpClient("smtp.qq.com",25);//实例一个SmtpClient类
                    Client.Credentials = new System.Net.NetworkCredential(txtusername.Text,txtpwd.Text);
                    //Client.Host = "smtp.126.com";
                    //附件
                    if (txtAttach.Text.Length > 0)
                    {
                        Mail.Attachments.Add(new Attachment(txtAttach.Text, MediaTypeNames.Application.Octet));
                    }
                    Client.Send(Mail);
                    MessageBox.Show("邮件发送成功！！！");

                }
                else
                    MessageBox.Show("请填写邮件内容！");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Application.Exit(); 

        }
    }
}