How to get the `comment_post_ID`?

<?php

function checkEmailAlreadyExists( $message_id ) {
    $posts_with_meta = get_posts( array(
        'posts_per_page' => 1, // we only want to check if any exists, so don't need to get all of them
        'post_type'      => 'faqpress-tickets',
        'meta_key'       => 'ticket_id',
        'meta_value'     => $message_id,
        'fields'         => 'ids', // we don't need it's content, etc.
    ) );

    return ( count( $posts_with_meta ) ) ? true : false;
}
$total = $emails->total_msg();

for ( $j=1; $j <= $total; $j++ ) {
    $mail = $emails->get( $j );
    if ( !empty( $mail['header']->message_id ) && !checkEmailAlreadyExists( $mail['header']->message_id )  ) {
        $post_array = array(
            'post_content'  => $mail['body'],
            'post_title'    => $mail['header']->subject,
            'post_type'     => 'faqpress-tickets',
            'post_author'   =>  ucwords(strstr($mail['header']->fromaddress, '<',true)),
            'post_status'   => 'publish',
            'meta_input'    => array(
                'User'      => ucwords(strstr($mail['header']->fromaddress, '<',true)),
                'From'      => preg_replace('~[<>]~', '', strstr($mail['header']->fromaddress, '<')),
                'Email'     => $mail['header']->Date,
                'ticket_id' => $mail['header']->message_id,
            ),
        );
      //wp_insert_post( $post_array );
    }
}

$posts = get_posts( array(
    'post_type'  => 'faqpress-tickets',
    'meta_key'   => 'ticket_id',
    'meta_value' => $mail['header']->message_id,
) );


if(! empty( $posts )){
 for($j = 1; $j <= $total; $j++){
            $mail = $emails->get($j);

    if ((!empty($mail['header']->references )) && (preg_replace('~[<]~','',strstr($mail['header']->references, '@',true))) == (preg_replace('~[<]~','',strstr($mail['header']->references, '@',true))))
                {

                    //echo htmlentities($mail['header']->message_id);
                    $comment_array = array(
                        'comment_content' => $mail['body'],
                        'comment_post_ID' => $posts,
                    );
                 //wp_insert_comment($comment_array);
                }
           }
}


/***
 function faqpress_author($data,$post_array){

 }

 add_filter("wp_insert_post_data", "faqpress_author", 10, 2);

$postType = "faqpress-tickets";
add_filter("wp_insert_post_data" . $postType, function ($data, $postarr) {
    if (0 === $postarr["ID"]) { // it's a new post
        $data["post_author"] = ucwords(strstr($mail['header']->fromaddress, '<',true));
    }
    return $data;
}, 10, 2);
***/

//Get all users and if user exists get username and email or else create new user as support customer.
$user = strstr($mail['header']->fromaddress, '<',true);
$email = $mail['header']->fromaddress;


for ($j=1; $j < $total; $j++) {
    $mail = $emails-> get($j);

if(email_exists($email)){
    add_post_meta($post_id, 'faqpress_ticket_username', $email, True);
    add_post_meta($post_id, 'faqpress_ticket_email', $user, True);
 }
    else{
         $userdata = array(
        'user_login'    => ucwords(strstr($mail['header']->fromaddress, '<',true)),
        'user_pass'     => '',
        'user_nicename' => ucwords(strstr($mail['header']->fromaddress, '<',true)),
        'display_name'  => ucwords(strstr($mail['header']->fromaddress, '<',true)),
        'user_email'    => strstr($mail['header']->fromaddress, '<'),
        'role'          => 'support_customer',
    );
    wp_insert_user($userdata);
}
}