C#邮件发送的实现方法

本段代码可以实现邮件的群发，

主要是利用了SMTP的知识，测试没有错误，转发请注明出处:http://www.cnblogs.com/aaaaa/

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.IO;

namespace 邮件发送
{
public partial class btnSend : Form
{
public btnSend()
{
InitializeComponent();
}

private void btnSendMail_Click(object sender, EventArgs e)
{

try
{
MailAddress Messagefrom = new MailAddress(this.txtSend.Text,"C#仰望着"); //发件人邮箱地址
string MessageTo = this.txtTo.Text; //收件人邮箱地址
string MessageSubject = this.txtSubject.Text; //邮件主题
string MessageBody = this.txtBody.Text; //邮件内容
Send(MessageTo, MessageSubject, MessageBody,Messagefrom);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

private void btnSend_Load(object sender, EventArgs e)
{
this.txtCounter.Text ="3";
this.txtSend.Text = "邮箱";
this.txtSenderPwd.Text = "邮箱密码";
this.cbHost.SelectedIndex = 0;//combobox选择当前列表中的第一个值

}

private void btnReset_Click(object sender, EventArgs e)
{
try
{
foreach (Control control in this.Controls)
{
if (control is TextBox)
{
TextBox txt = control as TextBox;
if (txt != null)
{
txt.Text = "";
}
this.txtSend.Text = "邮箱";
this.txtSenderPwd.Text = "邮箱密码";
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

private void cbHost_SelectedIndexChanged(object sender, EventArgs e)
{
cbHost.Text = cbHost.SelectedItem.ToString();//combobox获得当前选择的值。
}

public void Send(string MessageTo, string MessageSubject, string MessageBody, MailAddress Messagefrom)
{

try
{
txtTo.Text = txtTo.Text.Replace(" ", "");//去除空格
txtTo.Text = txtTo.Text.Trim();
txtTo.Text = txtTo.Text.Replace((char)13, (char)0);
MailMessage email = new MailMessage();
email.From = Messagefrom;
email.To.Add(MessageTo);//收件人邮箱地址可以是多个以实现群发
email.Subject = MessageSubject;
email.Body = MessageBody;
email.IsBodyHtml = false; //是否为html格式
email.Priority = MailPriority.Normal; //发送邮件的优先等级
SmtpClient sc = new SmtpClient();
sc.Host = cbHost.Text; //指定发送邮件的服务器地址或IP
sc.Port = 25;//指定发送邮件端口
sc.DeliveryMethod = SmtpDeliveryMethod.Network;//指定如何发送电子邮件
sc.UseDefaultCredentials = false;//是否随请求一起发送
sc.EnableSsl = false;//安全连接设置
sc.Credentials = new System.Net.NetworkCredential(this.txtSend.Text, this.txtSenderPwd.Text); //指定登录服务器的用户名和密码
sc.Send(email);
MessageBox.Show("邮件发送成功!","系统提示");
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}

}

#region 打开文件并且显示在richtextbox控件中
string fileName;
private void btnOpenFile_Click(object sender, EventArgs e)
{
OpenFileDialog op = new OpenFileDialog();
op.Filter = "文本文件(*.txt)|*.txt";
op.AddExtension = true;
op.DefaultExt = "txt";
op.CheckFileExists = true;
op.CheckPathExists = true;
if (op.ShowDialog() == DialogResult.OK)
{
fileName = op.FileName;
try
{
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fs.CanRead)
{
//读取时加入编码信息,否则读取汉字会乱码
StreamReader sr = new StreamReader(fs, Encoding.Default);
string strline = sr.ReadLine();
StringBuilder sb = new StringBuilder();
int counter = 0;
while (strline != null&&counter<Convert.ToInt32(this.txtCounter.Text.ToString()))
{
strline = sr.ReadLine()+",";
sb = sb.Append(strline);
++counter;
}
txtTo.Text = sb.ToString().Remove(sb.ToString().LastIndexOf(","), 1);
sr.Close();
//s = s.Replace(" ", "");

}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);

}

}

}
#endregion
#region 关闭系统的代码
private void btnSend_FormClosing(object sender, FormClosingEventArgs e)
{
if (MessageBox.Show("确实要退出本系统吗?", "系统提示", MessageBoxButtons.OKCancel)==DialogResult.OK)
{
this.Dispose();
Application.Exit();
e.Cancel = false;
}
else
{
e.Cancel = true;//阻止退出系统
}
}
#endregion
#region 系统最小化的设置
private void btnSend_SizeChanged(object sender, EventArgs e)
{
if (this.WindowState == FormWindowState.Minimized)
{
this.Hide();
this.notifyIcon1.Visible = true;
}
}
#endregion

private void notifyIcon1_Click(object sender, EventArgs e)
{
this.Visible = true;
this.WindowState = FormWindowState.Normal;
this.notifyIcon1.Visible =true;
}

private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Dispose();
Application.Exit();
}

private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Normal;
this.notifyIcon1.Visible = true;
this.Visible = true;
}

private void 隐藏ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.notifyIcon1.Visible = false;
}
}
}