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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.Net;
using System.Net.Configuration;
using System.Text;
using System.Windows.Forms;
using System.Net.Mail;
using System.Runtime.InteropServices;
using  System.Configuration;



namespace EmailSent
{
   
    public partial class Form1 : Form
    {
        private MailMessage msg;//用于构造邮件属性和方法
        public Form1()
        {
            InitializeComponent();
           
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
                msg = new MailMessage();//实例化
                //To邮件收信人地址属性 只读属性不能赋值  
                msg.To.Add("739807792@qq.com");
                //From邮件发件人地址属性  
                msg.From = new MailAddress("18058057961@163.com");
                //Subject邮件主题属性  
                msg.Subject = textBox3.Text;
                msg.SubjectEncoding = Encoding.UTF8;
                //Body设置邮件内容属性  
                msg.Body = richTextBox1.Text;
                msg.BodyEncoding = Encoding.UTF8;
                //发送邮件  
                msg.IsBodyHtml = true; // 内容是否为HTML格式
                SmtpClient client = new SmtpClient();
                client.UseDefaultCredentials = true;
                //邮件服务器设置smtp端口 默认25  
                client.Host = "smtp.163.com";
                client.Port = 25;
                //邮件发送方式 通过网络发送到SMTP服务器  
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                //凭证 发件人登录邮箱的用户名和密码  
                //string a = textBox4.Text.Trim();
                //string b = textBox5.Text.Trim();
                client.Credentials = new NetworkCredential("18058057961","*****");
                //NetworkCredential credential=new NetworkCredential();
                //credential.UserName = "m13857238454";
                //credential.Password = "*****";
                //client.Credentials = credential;
                try
                {
                    msg.IsBodyHtml = true;
                    client.Send(msg);
               
                //client.Send(msg);
                MessageBox.Show("邮件发送成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception)
            {

                MessageBox.Show("异常");
            }
        }
    }
}