<?
if($_POST['submit'] == "Send Mass Mail")
{
// When someone presses submit button given below
 
    if(count($_POST['email_ids']) >0)
    {
        foreach($_POST['email_ids'] as $key)
        {
             //mail function - (to_field, subject_field,msg_field,headers)
             // Set it accordingly
             $subject = "Your mailer subject";
             $to = $key;
             $msg = "Here is our product";
             mail($to,$subject,$msg,$header);
        }
    }
}
 
?>
 
// This is the form that shows all the emails and the checkboxes
 
<form name="emailfrm" method="post" action="">
<table border="0" cellpadding="2" cellspacing="1">
    <thead>
        <tr>
             <th>Email Id</th>
            <th>&nbsp;</th>
        </tr>
    </thead>
    <tbody>
       <?php
        $res = mysql_query("Select email from <tablename>");
        while($data = mysql_fetch_array($res))
        {
         // Show all the emails from the database. Choose the tablename above
        ?>
        <tr>
             <td><?php echo $data['email']; ?></td>
             <td><input type="checkbox" name="email_ids" id="email_ids" value="<?php echo $data['email']; ?>" /></td>
        </tr>
        <?php
        }
        ?>
        <tr>
             <td colspan="2"><input type="submit" name="submit" id="submit" value="Send Mass Mail" />
        </tr>
     </tbody>
</table>
</form>