PHP Mini Mailer

<?
    if (empty($_POST['Sa007'])) {
        $Sa002='';
        $Sa003='';
        $Sa004='';
        $Sa005='';
?>
    <DIV STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;">
        <FORM NAME="Sa001" METHOD="POST" ACTION="<?=$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING'];?>">
            <P STYLE="MARGIN: 2PX;">
                <B>N</B>ame Sender:&nbsp;<BR>
            </P>
            <P STYLE="MARGIN: 2PX;">
                <INPUT TYPE="TEXT" SIZE="45" NAME="Sa002" VALUE="<?=$Sa002 ? $Sa002 : "";?>" STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;">
            </P>

            <P STYLE="MARGIN: 2PX;">
                <B>E</B>-Mail Sender:&nbsp;<BR>
            </P>
            <P STYLE="MARGIN: 2PX;">
                <INPUT TYPE="TEXT" SIZE="45" NAME="Sa003" VALUE="<?=$Sa003 ? $Sa003 : "";?>" STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;">
            </P>

            <P STYLE="MARGIN: 2PX;">
                <B>S</B>ubject:&nbsp;<BR>
            </P>
            <P STYLE="MARGIN: 2PX;">
                <INPUT TYPE="TEXT" SIZE="45" NAME="Sa004" VALUE="<?=$Sa004 ? $Sa004 : "";?>" STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;">
            </P>

            <P STYLE="MARGIN: 2PX;">
                <B>M</B>essage:&nbsp;<BR>
            </P>
            <P STYLE="MARGIN: 2PX;">
                <TEXTAREA COLS="42" ROWS="10" NAME="Sa005" STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;"><?=$Sa005 ? htmlspecialchars(base64_decode($Sa005)) : "";?></TEXTAREA>
            </P>

            <P STYLE="MARGIN: 2PX;">
                <B>L</B>ist Mail Receiver:&nbsp;<BR>
            </P>
            <P STYLE="MARGIN: 2PX;">
                <TEXTAREA COLS="42" ROWS="10" NAME="Sa006" STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;"></TEXTAREA>
            </P>

            <P STYLE="MARGIN: 2PX;">
                <INPUT TYPE="SUBMIT" NAME="Sa007" VALUE="Go!" STYLE="FONT-FAMILY: 'VERDANA';FONT-SIZE: 12px;BORDER: 1PX Solid #000000;"></TEXTAREA>
            </P>
        </FORM>
    </DIV>
<?
    } else {
        @set_time_limit(0);
        $Sa=$_POST['Sa002'];
        $Sb=$_POST['Sa003'];
        $Sc=$_POST['Sa004'];
        $Sd=$_POST['Sa005'];
        $Se=$_POST['Sa006'];
        $Sf=explode("\n",$Se);
        $Sg=sizeof($Sf);
        function xsend($Xa,$Xb,$Xc,$Xd,$Xe) {
                $Xf = "MIME-Version: 1.0\n";
                $Xf .= "Content-Type: text/html; charset=ISO-8859-1\n";
                $Xf .= "Content-Transfer-Encoding: 7bit\n";
                $Xf .= "Content-Disposition: inline\n";
                $Xf .= "From: \"".$Xa."\" <".$Xb.">\n";
                return @mail($Xc,$Xd,"\n".stripslashes($Xe)."\n",$Xf);
        }
        $Sz=1;
        print("<DIV STYLE=\"FONT-FAMILY: 'Courier New';FONT-SIZE: 13px;\">");
        foreach($Sf as $Sh) {
            $Si=trim($Sh);
            $Sj=xsend($Sa,$Sb,$Si,$Sc,$Sd);
            if (!empty($Sj)) {
                print("<P STYLE=\"MARGIN: 2PX;COLOR: #0000FF;\">");
                print("[{$Sz}/{$Sg}] [&nbsp;&nbsp;OK&nbsp;&nbsp;] Sending...: {$Si}!");
                print("</P>");
            } else {
                print("<P STYLE=\"MARGIN: 2PX;COLOR: #FF0000;\">");
                print("[{$Sz}/{$Sg}] [Failed] Sending...: {$Si}!");
                print("</P>");
            }
            $Sz++;
        }
        print("</DIV>");
    }
?>