一个在线发EMAIL的例子

<?include("header.inc.php")?>
<?
$to
="[email protected]";
if(
$submit && $to){
  if(!
$title)$title="";
if(!
$message)$message="";
  if(
$from){
    
$from="From:$from \n";
    
$reply="Reply-To:$from \n";
    }else{
     
$from="";
     }
   if(
$cc){
      
$cc="CC:$cc";
      }else{
       
$cc="";
      }
    
/* if (!eregi("^[_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3}$",$from)) {
         echo "<p align=center><font color=red size=4><b>E-Mail地址格式不对。</b>请<a href=javascript:history.go(-1);>返回</a></font></p>";
         include("foot.inc.php");
       exit();
    } */
   
if(@mail($to,$title,$message,$from.$reply.$cc)){
      echo 
"<p align=center><font color=red size=4><b>恭喜你!你的邮件发送成功!</b>请<a href=javascript:history.go(-1);>返回</a></font></p>";
      include(
"foot.inc.php");
         exit();
      }else{
        echo 
"<p align=center><font color=red size=4><b>对不起!你的邮件发送不成功!</b>请<a href=javascript:history.go(-1);>返回</a></font></p>";
         include(
"foot.inc.php");
         exit();
      }
  }
?>

  <table width="87%" border="0">
    <tr>
      <td><font color="#000066">当前位置:<a href="index.php">主页</a>&gt;&gt;意见信箱</font></td>
    </tr>
  </table>
</div>
<div align=center>
  <table width="75%" border="0">
    <tr> 
      <td height="21"> 
        <div align="center"><font color="#993399">如果你对我们的工作有什么意见,请填好下面的内容,然后EMAIL给我们。</font></div>
      </td>
    </tr>
  </table>
  <form action="email.php" method="post">
    <table width="88%" border="0">
      <tr> 
        <td bgcolor="#FFFFDD">&nbsp;</td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"><font color="#0000FF">收信人E-MAIL: 
          <input type="text" name="to" size="50" value="[email protected]">
          </font></td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"><font color="#0000FF">发信人E-MAIL: 
          <input type="text" name="from" size="50">
          </font></td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"><font color="#0000FF">抄    送: 
          <input type="text" name="cc" size="50">
          </font></td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"><font color="#0000FF">标    题: 
          <input type="text" name="title" size="50">
          </font></td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"><font color="#0000FF">正    文:</font></td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"> 
          <div align="center"><font color="#0000FF"> 
            <textarea name="message" rows="8" cols="70"></textarea>
            </font></div>
        </td>
      </tr>
      <tr> 
        <td bgcolor="#FFFFDD"> <center> 
          <input type="submit" name="submit" value="发送">
          <input type="reset" name="cancel" value="取消">
          </center></td>
      </tr>
    </table>
    
    </form>
</div>
<?include("foot.inc.php")?>
</body>
</html>