简单的客户端邮件发送系统（winform版）

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;

namespace _13._1._4练习

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

MailMessage msg = new MailMessage();

msg.Subject = this.textBox2.Text; //标题

msg.Body = this.textBox3.Text; //内容

msg.From=new MailAddress("duan_linlin@163.com"); //邮件来自哪

msg.To.Add(this.textBox1.Text);

SmtpClient client=new SmtpClient(); //允许传输协议

client.Host = "smtp.163.com"; //发件方服务器地址

client.Port = 25; //发件方端口

NetworkCredential credential = new NetworkCredential();

credential.UserName = "duan_linlin@163.com";

credential.Password = "jinyuxueqi521";

client.Credentials = credential; //说明证书要给代理证书credential

Attachment att = new Attachment(this.textBox4.Text);

msg.Attachments.Add(att);

client.Send(msg);

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void button2_Click(object sender, EventArgs e)

{

if (this.openFileDialog1.ShowDialog()==System.Windows.Forms.DialogResult.OK)

{

this.textBox4.Text = this.openFileDialog1.FileName;

}

}

}

}