Exemplo VAB

<?php
$db = mysql_connect("dbmy0017.whservidor.com","newsletter","000000");
$banco = mysql_select_db("newsletter",$db);

$de        = $_POST['de'];
$assunto   = $_POST['assunto'];
$msg       = $_POST['codigo'];
$cabecalho  = "MIME-Version: 1.0\r\n";
$cabecalho .= "Content-type: image/jpeg\r\n";
$cabecalho .= "Content-type: text/html; charset-iso-8859-1\r\n";
$cabecalho .= "From: $de";
        $sql = mysql_query("SELECT * FROM email");
        while($linha = mysql_fetch_array($sql)) {
                mail($linha['email'], "$assunto", $msg, $cabecalho);
        }
header("Location: form_envia.php");

?>