在PHP中隐藏无用的变量

inside of a basic PHP email processor I have some var's that came form checkbox tags, the problem is that there are like 20 checkbox tags in the HTML Doc. and the user is just going to select a couple of them.

How can I hide or eliminate the PHP vars so when my client receive this form by email the HTML jus show the checkbox that the customer selected instead of a white spaced list with just a couple of them? or should I do it with JS in the HTML?

Here my code:

<?php

// ******* PROCESS EMAILS
$emailSubject = 'Solicitud de Servicio ERASE - '.$_POST['nombreNovia'];
$webMaster = '--@live.com';


// INFO. DE LA NOVIA
$nombreNovia = $_POST['nombreNovia'];
$domicilioNovia = $_POST['domicilioNovia'];
$ciudadNovia = $_POST['ciudadNovia'];
$emailNovia = $_POST['emailNovia'];
$celularNovia = $_POST['celularNovia'];
$telefonoNovia = $_POST['telefonoNovia'];
$lugarNacimientoNovia = $_POST['lugarNacimientoNovia'];
$fechaNacimientoNovia = $_POST['fechaNacimientoNovia'];
$religionNovia = $_POST['religionNovia'];
$profesionNovia = $_POST['profesionNovia'];
$anteriorNovia = $_POST['anteriorNovia'];


// INFO. DEL NOVIO
$nombreNovio = $_POST['nombreNovio'];
$domicilioNovio = $_POST['domicilioNovio'];
$ciudadNovio = $_POST['ciudadNovio'];
$emailNovio = $_POST['emailNovio'];
$celularNovio = $_POST['celularNovio'];
$telefonoNovio = $_POST['telefonoNovio'];
$lugarNacimientoNovio = $_POST['lugarNacimientoNovio'];
$fechaNacimientoNovio = $_POST['fechaNacimientoNovio'];
$religionNovio = $_POST['religionNovio'];
$profesionNovio = $_POST['profesionNovio'];
$anteriorNovio = $_POST['anteriorNovio'];


// INFO. DEL EVENTO
$tipoEvento = $_POST['tipoEvento'];
$lugarEvento = $_POST['lugarEvento'];
$fechaEvento = $_POST['fechaEvento'];
$numeroInvitados = $_POST['numeroInvitados'];
$porcentajeForaneos = $_POST['porcentajeForaneos'];

$tipoCeremonia = $_POST['tipoCeremonia'];
$numeroInvitadosCeremonia = $_POST['numeroInvitadosCeremonia'];
$numeroHorasCeremonia = $_POST['numeroHorasCeremonia'];
$desdeCeremonia = $_POST['desdeCeremonia'];
$hastaCeremonia = $_POST['hastaCeremonia'];

$tipoRecepcion = $_POST['tipoRecepcion'];
$numeroInvitadosRecepcion = $_POST['numeroInvitadosRecepcion'];
$numeroHorasRecepcion = $_POST['numeroHorasRecepcion'];
$desdeRecepcion = $_POST['desdeRecepcion'];
$hastaRecepcion = $_POST['hastaRecepcion'];

$diasEvento = $_POST['diasEvento'];
$pedida = $_POST['pedida'];
$despedida = $_POST['despedida'];
$ensayo = $_POST['ensayo'];
$tornaboda = $_POST['tornaboda'];

$hotelesSede = $_POST['hotelesSede'];
$plan = $_POST['plan'];


// DEFINIENDO EL EVENTO
$eventoFormal = $_POST['eventoFormal'];
$eventoSemiformal = $_POST['eventoSemiformal'];
$eventoCasual = $_POST['eventoCasual'];

$atmosferaElegante = $_POST['atmosferaElegante'];
$atmosferaTradicional = $_POST['atmosferaTradicional'];
$atmosferaTematica = $_POST['atmosferaTematica'];
$atmosferaDivertida = $_POST['atmosferaDivertida'];

$banqueteEmplatado = $_POST['banqueteEmplatado'];
$banqueteBuffet = $_POST['banqueteBuffet'];
$banqueteCoktail = $_POST['banqueteCoktail'];
$banqueteTiempos = $_POST['banqueteTiempos'];

$decoracionClasico = $_POST['decoracionClasico'];
$decoracionRomantico = $_POST['decoracionRomantico'];
$decoracionMinimalista = $_POST['decoracionMinimalista'];
$decoracionVintage = $_POST['decoracionVintage'];
$decoracionModerno = $_POST['decoracionModerno'];
$decoracionCaribeño = $_POST['decoracionCaribeño'];
$tematico = $_POST['tematico'];

$color1 = $_POST['color1'];
$color2 = $_POST['color2'];

$prioridades = $_POST['prioridades'];
$noDeseado = $_POST['noDeseado'];


// SERVICIOS A MANEJAR
$servicioBanquete = $_POST['servicioBanquete'];
$ServicioDecoracion = $_POST['ServicioDecoracion'];
$ServicioPirotecnia = $_POST['ServicioPirotecnia'];
$servicioBebidas = $_POST['servicioBebidas'];
$ServicioEdecanes = $_POST['ServicioEdecanes'];
$servicioPostres = $_POST['servicioPostres'];
$servicioImpresos = $_POST['servicioImpresos'];
$servicioPastel = $_POST['servicioPastel'];
$servicioFlores = $_POST['servicioFlores'];
$servicioCotillones = $_POST['servicioCotillones'];
$servicioAnimacion = $_POST['servicioAnimacion'];
$servicioMobiliario = $_POST['servicioMobiliario'];
$servicioFavors = $_POST['servicioFavors'];
$servicioIluminacion = $_POST['servicioIluminacion'];
$servicioDj = $_POST['servicioDj'];
$servicioGrupoMusical = $_POST['servicioGrupoMusical'];
$servicioPlantaLuz = $_POST['servicioPlantaLuz'];
$servicioMusicaAmbiental = $_POST['servicioMusicaAmbiental'];
$servicioMesaDulces = $_POST['servicioMesaDulces'];
$servicioFotoVideo = $_POST['servicioFotoVideo'];
$servicioRentaAutos = $_POST['servicioRentaAutos'];
$servicioValetParking = $_POST['servicioValetParking'];

// INVERSION
$presupuesto = $_POST['presupuesto'];
$otrasAgencias = $_POST['otrasAgencias'];
$notas = $_POST['notas'];


   ob_start();

?>

<body style="font-size: 14px; font-family: sans-serif; margin: 0px; padding: 0px; color: #4D4D4D; background-color: #FAFAFA; -moz-box-sizing:border-box; box-sizing:border-box;">
    <div style="width: 100%; padding-left: 24px; padding-top: 24px; padding-bottom: 24px; background-color: #4D4D4D; -moz-box-sizing:border-box; box-sizing:border-box;">
        <img src="http://www.erase.com.mx/erase/email/img/logoEmail.png" alt="Logo ERASE">
    </div>
    <div style="padding: 0px 24px; -moz-box-sizing:border-box; box-sizing:border-box;">
        <h1 style="text-align: center; font-size: 2.4em; line-height: 5em; font-weight: bold;">Solicitud de Servicio</h1>

        <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
            <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">INFO. DE LA NOVIA</h2>
            <p style="margin-left: 12px;">
                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NOMBRE:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$nombreNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">DOMICILIO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$domicilioNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">CIUDAD:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$ciudadNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">EMAIL:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$emailNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">CELULAR:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$celularNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TELEFONO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$telefonoNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">LUGAR DE NACIMIENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$lugarNacimientoNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">FECHA DE NACIMIENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$fechaNacimientoNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">RELIGION:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$religionNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">PROFESION:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$profesionNovia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">EVENTO ANTERIOR:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$anteriorNovia</span><br/><br/>
            </p>
        </div>

        <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
            <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">INFO. DEL NOVIO</h2>
            <p style="margin-left: 12px;">
                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NOMBRE:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$nombreNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">DOMICILIO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$domicilioNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">CIUDAD:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$ciudadNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">EMAIL:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$emailNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">CELULAR:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$celularNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TELEFONO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$telefonoNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">LUGAR DE NACIMIENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$lugarNacimientoNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">FECHA DE NACIMIENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$fechaNacimientoNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">RELIGION:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$religionNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">PROFESION:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$profesionNovio</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">EVENTO ANTERIOR:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$anteriorNovio</span><br/><br/>
            </p>
        </div>

        <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
            <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">INFO. DEL EVENTO</h2>
            <p style="margin-left: 12px;">
                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TIPO DE EVENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$tipoEvento</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">LUGAR DEL EVENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$lugarEvento</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">FECHA DEL EVENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$fechaEvento</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NUMERO DE INVITADOS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$numeroInvitados</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">% DE FORANEOS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$porcentajeForaneos</span><br/><br/>

            <span style="font-size: 1em; color: #888888; line-height: 3em;">CEREMONIA</span><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TIPO DE CEREMONIA:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$tipoCeremonia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NUMERO DE INVITADOS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$numeroInvitadosCeremonia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NUMERO DE HORAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$numeroHorasCeremonia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">DESDE LAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$desdeCeremonia</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">HASTA LAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$hastaCeremonia</span><br/><br/>

            <span style="font-size: 1em; color: #888888; line-height: 3em;">RECEPCION</span><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TIPO DE RECEPCION:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$tipoRecepcion</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NUMERO DE INVITADOS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$numeroInvitadosRecepcion</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NUMERO DE HORAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$numeroHorasRecepcion</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">DESDE LAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$desdeRecepcion</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">HASTA LAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$hastaRecepcion</span><br/><br/>

            <span style="font-size: 1em; color: #888888; line-height: 3em;">EVENTO</span><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">DIAS DE EVENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$diasEvento</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">PEDIDA:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$pedida</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">DESPEDIDA:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$despedida</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">ENSAYO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$ensayo</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TORNABODA:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$tornaboda</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">HOTELES SEDE:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$hotelesSede</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">PLAN:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$plan</span><br/><br/>
            </p>
        </div>

        <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
            <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">DEFINIENDO EL EVENTO</h2>
            <p style="margin-left: 12px;">
                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">ESTILO DEL EVENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$eventoFormal</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$eventoSemiformal</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$eventoCasual</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">ATMOSFERA DESEADA:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$atmosferaElegante</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$atmosferaTradicional</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$atmosferaTematica</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$atmosferaDivertida</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">TIPO DE BANQUETE:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$banqueteEmplatado</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$banqueteBuffet</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$banqueteCoktail</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$banqueteTiempos tiempos</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">ESTILO DE DECORACION:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$decoracionClasico</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$decoracionRomantico</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$decoracionMinimalista</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$decoracionVintage</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$decoracionModerno</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$decoracionCaribeño</span><br/><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$tematico</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">COLORES BASE:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$color1 y $color2</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">PRIORIDADES DEL EVENTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$prioridades</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NO DESEADO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$noDeseado</span><br/><br/>
            </p>
        </div>

        <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
            <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">SERVICIOS A MANEJAR</h2>
            <p style="margin-left: 12px;">
                <?php
                    foreach ($_POST as $key => $value) {
                        if (strtolower(substr($key, 0, 8)) == 'servicio' && !empty($value)) {
                            ?>
                                <span class="answer" style="margin-left: 6px; line-height: 1.4em;"><?php echo $value; ?></span><br/><br/>
                            <?php
                        }
                    }
                ?>
            </p>
        </div>

        <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
            <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">PRESUPUESTO</h2>
            <p style="margin-left: 12px;">
                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">PRESUPUESTO:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$presupuesto</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">YA HE COTIZADO CON:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$otrasAgencias</span><br/><br/>

                <span class="label" style="font-size: .8em; color: #888888; line-height: 1.2em;">NOTAS:</span><br/>
                <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$notas</span><br/><br/>
            </p>
        </div>

    </div>
<body>
<?php

    $body = ob_get_clean();

$headers = "From: $emailNovia
";
$headers .= "Content-type:  text/html
";
$success = mail($webMaster, $emailSubject, $body, $headers);


// ******* PROCESS EMAILS
//$message = "Gracias por contactarnos. Nos pondremos en contacto con usted cuanto antes<br />Atte:<br />(Lic. Cristina Madrid)";
//$subject = "¡Gracias por escribirnos!";

//$headers2 = "From: $webmaster
";
//$headers2 .= "Content-type:  text/html
";
//mail($leademail, $subject, $message, $headers2);


// ******* REDIRECTION
header('Location: http://www.erase.com.mx/index.html')
?>

You should create an array and assign $_POST directly to the array, so the keys will be automatically created. Then loop thru the array and print only the values of the keys that are not empty.

You can simply iterate through $_POST to only show the values not empty (I've also added a check to make sure that the $_POST key must start with servicio, just in case you have other POST values).

Here we use a mix of output buffers (ob_start, ob_get_clean - they make sure that we can put it all into a variable instead of outputting it straight away), and !empty() making sure that our string isn't empty.

<?php
    // ******* PROCESS EMAILS
    $emailSubject = 'Solicitud de Servicio ERASE - '.$_POST['nombreNovia'];
    $webMaster = '@.com';

    ob_start();

    ?>
        <body style="font-size: 14px; font-family: sans-serif; margin: 0px; padding: 0px; color: #4D4D4D; background-color: #FAFAFA; -moz-box-sizing:border-box; box-sizing:border-box;">
            <div style="width: 100%; padding-left: 24px; padding-top: 24px; padding-bottom: 24px; background-color: #4D4D4D; -moz-box-sizing:border-box; box-sizing:border-box;">
                <img src="http://www.erase.com.mx/erase/email/img/logoEmail.png" alt="Logo ERASE">
            </div>
            <div style="padding: 0px 24px; -moz-box-sizing:border-box; box-sizing:border-box;">
                <h1 style="text-align: center; font-size: 2.4em; line-height: 5em; font-weight: bold;">Solicitud de Servicio</h1>

                <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">
                    <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">INFO. DE LA NOVIA</h2>
                    <div style="width: 100%; text-align: left; margin-bottom: 48px; -moz-box-sizing:border-box; box-sizing:border-box;">

                        <h2 style="text-align: left; font-size: 1.3em; width: 100%; margin-bottom: 20px;">SERVICIOS A MANEJAR</h2>
                        <p style="margin-left: 12px;">
                            <?php
                                foreach ($_POST as $key => $value) {
                                    if (strtolower(substr($key, 0, 8)) == 'servicio' && !empty($value)) {
                                        ?>
                                            <span class="answer" style="margin-left: 6px; line-height: 1.4em;"><?php echo $value; ?></span><br/><br/>
                                        <?php
                                    }
                                }
                            ?>
                        </p>
                    </div>
                </div>
            </div>
        </body>
    <?php

    $body = ob_get_clean();

    $headers = "From: $emailNovia
";
    $headers .= "Content-type:  text/html
";
    $success = mail($webMaster, $emailSubject, $body, $headers);


    // ******* PROCESS EMAILS
    //$message = "Gracias por contactarnos. Nos pondremos en contacto con usted cuanto antes<br />Atte:<br />(Lic. Cristina Madrid)";
    //$subject = "¡Gracias por escribirnos!";

    //$headers2 = "From: $webmaster
";
    //$headers2 .= "Content-type:  text/html
";
    //mail($leademail, $subject, $message, $headers2);


    // ******* REDIRECTION
    header('Location: http://www.---.html')
?>

Note that you haven't defined $emailNovia anywhere in your code (for use in From: $emailNovia). Also note that if you get this value ($emailNovia) from the user that you need to make sure it's safe, or otherwise someone could inject a bunch of headers and use your server to send spam to everyone they wanted.

First you need to use an array :

$services = array(
    $_POST['servicioBanquete'],
    $_POST['ServicioDecoracion'],
    $_POST['ServicioPirotecnia'],
    $_POST['servicioBebidas'],
    ...
);

Then create your table dynamically :

<?php foreach($services as $service) : ?>
    <?php if(!empty($service)) : ?>
        <span class="answer" style="margin-left: 6px; line-height: 1.4em;">$servicioBanquete</span><br/><br/>
    <?php endif; ?>
<?php endforeach; ?>

Consider changing your checkbox inputs from this:

<input type='checkbox' name='servicioBanquete'>
<input type='checkbox' name='servicioDecoracion'>
<input type='checkbox' name='servicioPirotecnia'>

...into this:

<input type='checkbox' name='servicio[Banquete]'>
<input type='checkbox' name='servicio[Decoracion]'>
<input type='checkbox' name='servicio[Pirotecnia]'>

This way, when the form is posted, you will be provided with a $_POST['servicio'] array. Moreover, it's an associative array that only contains the checked values and nothing more, so no empty() check is required.

For a proof of concept, try this:

<!DOCTYPE html>
<html>
  <head>
    <title>Checkboxes Array</title>
  </head>
  <body>
    <pre><?php print_r($_POST); ?></pre>
    <form method='post'>
      <p><input type='checkbox' name='servicio[Banquete]'>Banquete</p>
      <p><input type='checkbox' name='servicio[Decoracion]'>Decoracion</p>
      <p><input type='checkbox' name='servicio[Pirotecnia]'>Pirotecnia</p>
      <p><input type='submit' value='Go'></p>
    </form>
  </body>
</html>