Вова

address+randomtext@gmail.com
add.ress@gmail.com
a.dd.ress@gmail.com

foreach ($posts as $post) {
    $comments_number = get_comments_number($post->ID);
    if ($comments_number == 0) {
        array_push($new_posts, $post);
    }
}

foreach ($posts as $post) {
    if (strpos($post->post_title, "МСК+0") === false) // <<<==== вот этот блок
        continue;

    $comments_number = get_comments_number($post->ID);
    if ($comments_number == 0) {
        array_push($new_posts, $post);
    }
}

$phone = get_field( 'crm_telephone' );
$phone = preg_replace( '/\D/', '', $phone );
echo '<a href="tel:' . esc_attr( $phone ) . '">' . esc_html( get_field( 'crm_telephone' ) ) . '</a>';

$phone = get_field('crm_telephone');
$phone = str_replace('+', '', $phone);
echo $phone;