If you are working in classic mode, here is a way to do it. deactivate email sent in your form properties. then go again to your form properties and select the tab for transmit?!. I don't know how it is named in english, but it is the last tab. Then select Begin Transmit and set this code:
// load the standard FacileForms library
$this->execPieceByName('ff_InitLib');
// Subject
$Thema = ff_getsubmit('txtThema');
// Date
$Datum = ff_getsubmit('txtDatum');
// Company
$Firma = ff_getsubmit('txtFirma');
// Name
$Name = ff_getsubmit('txtName');
// Phone
$Telefon = ff_getsubmit('txtTelefon');
// EMail
$EMail = ff_getsubmit('txtEMail');
// City
$Ort = ff_getsubmit('txtOrt');
// People
$Personen = ff_getsubmit('txtPersonen');
// Extra
$Zusatz = ff_getsubmit('txtZusatz');
// declare globals used in this piece
global $mosConfig_mailfrom, $mosConfig_fromname;
// E-Mail Text (HTML)
$ultimatetext = "<html><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 20px;font-weight: bold;color:#006699;'><u>Anmeldung</u></span><br/><br/><br/><div style='margin-left: 50px;'><table style='Border: 1px solid #ececec;'>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Veranstaltung:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Thema . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Datum:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Datum . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Firma:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Firma . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Name:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Name . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Telefon:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Telefon . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>E-Mail:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $EMail . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Ort:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Ort . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Personen:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Personen . "</span></td></tr>" .
"<tr><td style='width:250px;'><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#000000;'>Weitere Bemerkungen:</span></td><td><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 14px;font-weight: bold;color:#006699;'>" . $Zusatz . "</span></td></tr>" .
"</table></div><br/><br/><hr/><span style='font-family: Segoe UI,Arial,Helvetica,sans-serif;font-size: 12px;color:#BFBFBF;'>test 2010</span>" .
"</html>";
// send the mail
$this->sendMail(
'sender', // email addr of submitter (1)
'TEST', // name of submitter (1)
'recepient', // email of recipient (2)
'Anmeldung: ' . $Thema . ' ( zum ' . $Datum . ' )', // subject of the mail (3)
$ultimatetext, // body of the mail (3)
NULL,
'TRUE', // HTML-Trigger
NULL,
NULL);