Send field form array by AJAX and get it on php in WordPress

I’m making a plugin on WordPress to send emails to our clients. I have a trouble with a field array type of form, because i can’t get it on PHP function. I can get single fields, as subject or message, but not email field (it’s an array creted dynamically for clients that have multiple emails)

Here my form code

echo '<form id="myform" method="post">';

    echo "<ul>";

    echo "<li><strong>¿Cual es el destinatario del email? (pueden ser varios)</strong></li>";

    if( get_field('contactos',$post_id) ): 
        while( has_sub_field('contactos',$post_id) ): 

            echo "<li style='margin-left: 45px; margin-top: 15px;'><input type='checkbox' id='emails[]' value='".get_sub_field('email',$post_id)."'>"
        .get_sub_field('nombre',$post_id)." (".get_sub_field('email',$post_id)." )</li>";

        endwhile;

    endif;  

    echo '<li style="margin-top: 15px;"><strong><label for="subject">Asunto: </label></strong>';
    echo '<input id="subject" maxlength="45" size="30" name="subject"></li>';

    echo "<p>Texto del mensaje</p>";
    echo '<textarea id="cuerpo" class="textarea" name="cuerpo" placeholder="" style="
        width: 600px;
        height: 200px;
    "></textarea><br>';

    echo '<li style="margin-top: 35px;"><input id="send" name="submit" type="submit" value="Enviar eMail" class="button button-primary button-large"></li>';

    echo "</form>";

Here ajax.js

$( "#myform" ).submit(function( event ) {
            event.preventDefault(); 
            alert( "Handler for .submit() called." );
            $(function() { 
                $('#sendingemails').fadeIn();
                var subject = $("#subject").val();
                var cuerpo = $("#cuerpo").val();
                $.ajax({
                        type: 'POST',
                        url: GestionAjax.ajaxurl,
                        data: { action: 'email', subject : subject, cuerpo : cuerpo, emails :  $('#emails').serialize() },
                        // Mostramos un mensaje con la respuesta de PHP
                        success: function(data) {
                            alert("enviado");
                            $('#sendingemails').fadeOut();
                        },
                        error: function(XMLHttpRequest, textStatus, errorThrown) { 
                            alert("Status: " + textStatus); alert("Error: " + errorThrown);
                            alert (jsonString);
                    }   
                    })
            });

        });

and here the function that recive data:

function AC_ONEmail() {

    $emails = array();

    $emails = $_POST['emails'];
    $message = $_POST['cuerpo'];
    $subject = $_POST['subject'];

    add_action('phpmailer_init','send_smtp_email');

    $headers[] = 'From: '.$current_user->display_name.' '.$current_user->user_email;
    add_filter( 'wp_mail_content_type', 'my_custom_email_content_type' );

    $message .= '<br><br>'.nl2br($current_user->firma);

    foreach ($emails as $email) {
        $result=wp_mail( $email, $subject, $message, $headers);

        if (!$result) {
            global $ts_mail_errors;
            global $phpmailer;
            if (!isset($ts_mail_errors)) $ts_mail_errors = array();
            if (isset($phpmailer)) {
                $ts_mail_errors[] = $phpmailer->ErrorInfo;
                }
        } else { 
                global $wpdb;
                $wpdb->insert( 
                    'wp_comunicaciones', 
                    array( 
                        'post_id' => $idcliente,
                        'asunto' => $datos2,
                        'cuerpo' => $message,
                        'fecha' => date("Ymd"),
                        'responsable' => $current_user->display_name,
                        'email' => $email[0]
                    )
                );

                /*envio del email a una carpeta del servidor
                $mail_string = "From: ".$current_user->user_email."rn". "To: ".$value."rn"."Subject: ".$_POST['subject']."rn"."rn".$_POST['cuerpo']."rn";
                $stream = imap_open("{smtp.office365.com}Elementos enviados", $current_user->cuenta_usuario, $current_user->passwordSMTP);
                imap_append($stream, "{smtp.office365.com}Elementos enviados", $mail_string, "\Seen");
                */
                }

    }

    $arr = array( "asunto" => $_POST['subject'], "cuerpo" => $_POST['cuerpo'], "emails" => $_POST['emails']);

    echo json_encode($arr);

    wp_die();
}

As i said, i debug vars on console (network tab on chrome), and subject and message have values, but don’t clientes (an array type field)

I see a lot of info here, on stackoverflow, i try to do by different ways, but i spend two days on it, and now i need your knowledge. How can i do it?

Thanks

UPDATE SOLUTION

I take a solution

On ajax script i change data line with this data: { action: 'email', datos : $('#myform').serialize() }, and on function that recive data i insert parse_str($_POST['datos'], $arraydatos); Then i take data with $arraydatos['emails'] or field that i want. It works fine!