C# 邮件发送，可根据需求修改为群发~



	 

	
		我直接上图 上代码吧。
	
		 
	
		
	
		 
	
		代码：
	
		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; 
	
		using System.Net.Mail; 
	
		using System.Net.Mime; 
	
		using System.IO; 
	
		 
	
		namespace SendMailExample 
	
		{ 
	
		    /// <summary> 
	
		    /// 作者：Andrew 
	
		    /// Blog: http://blog.csdn.net/Andrew_wx 
	
		    /// </summary>
	
		    public partial class FormSendMail : Form 
	
		    { 
	
		        public FormSendMail() 
	
		        { 
	
		            InitializeComponent(); 
	
		        } 
	
		 
	
		        private void FormSendMail_Load(object sender, EventArgs e) 
	
		        { 
	
		            txtSmtpServer.Text = "smtp.qq.com"; 
	
		            txtSend.Text = "heuandmei@qq.com"; 
	
		            txtDisplayName.Text = "Andrew(王旭)"; 
	
		            txtPassword.Text = "";//密码 
	
		            txtReceive.Text = "heuandmei@qq.com"; 
	
		            txtTitle.Text = "发信测试"; 
	
		            txtBody.Text = "This is a test(测试)"; 
	
		            rbtnNoSSL.Checked = true; 
	
		        } 
	
		 
	
		        private void btnAddFiles_Click(object sender, EventArgs e) 
	
		        { 
	
		            OpenFileDialog odlg = new OpenFileDialog(); 
	
		            odlg.CheckFileExists = true; 
	
		            //只接收有效的文件名 
	
		            odlg.ValidateNames = true; 
	
		            //允许一次选择多个文件作为附件 
	
		            odlg.Multiselect = true; 
	
		            if (odlg.ShowDialog() == System.Windows.Forms.DialogResult.OK) 
	
		            { 
	
		                lstFiles.Items.AddRange(odlg.FileNames); 
	
		            } 
	
		             
	
		        } 
	
		 
	
		        private void btnSend_Click(object sender, EventArgs e) 
	
		        { 
	
		            this.Cursor = Cursors.WaitCursor; 
	
		            MailMessage mail = new MailMessage(); 
	
		            mail.From = new MailAddress( 
	
		                txtSend.Text, txtDisplayName.Text, Encoding.UTF8); 
	
		            mail.To.Add(txtReceive.Text); 
	
		            mail.Subject = txtTitle.Text; 
	
		            mail.SubjectEncoding = Encoding.Default; 
	
		            mail.Body = txtBody.Text; 
	
		            mail.BodyEncoding = Encoding.Default; 
	
		            mail.IsBodyHtml = false; 
	
		            mail.Priority = MailPriority.Normal; 
	
		            //添加附件 
	
		            Attachment attachment = null; 
	
		            if (lstFiles.Items.Count > 0) 
	
		            { 
	
		                for (int i = 0; i < lstFiles.Items.Count; i++) 
	
		                { 
	
		                    string pathFileName = lstFiles.Items[i].ToString(); 
	
		                    string extName = Path.GetExtension(pathFileName).ToLower(); 
	
		                    //判断附件类型 
	
		                    if (extName == ".rar" || extName == ".zip") 
	
		                    { 
	
		                        attachment = new Attachment(pathFileName, MediaTypeNames.Application.Zip); 
	
		                    } 
	
		                    else 
	
		                    { 
	
		                        attachment = new

补充：软件开发 , C# ,