写个邮件群发程序

写个邮件群发程序？改怎么写我的前台：
<body>
<p>
  邮件发送程序
</p>
<form id="form1" name="form1" method="post" action="">
  <table width="70%" height="92" border="0" cellpadding="0" cellspacing="0">
    <tr>
      <td width="9%"> 收件人： </td>
      <td width="91%"><label>
        <textarea name="emial_name" cols="50" id="emial_name"></textarea>
      </label></td>
    </tr>
    <tr>
      <td>主 题：</td>
      <td><label>
        <input name="emial_title" type="text" id="emial_title" size="60" />
      </label></td>
    </tr>
    <tr>
      <td>内 容：</td>
      <td><textarea name="emial_text" cols="50" id="emial_text"></textarea></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td><label>
        <input type="submit" name="Submit" value="发送邮件" />
      </label></td>
    </tr>
  </table>
</form>
后台怎么写代码： 谢谢