wordpress: Mail filter to check, change email or mark as spam

Example 1:
// Redirect to John Doe if mail body contains 'John Doe'
add_filter('wp_mail', 'medialog_john_doe', 99);
function medialog_john_doe($args)
{
   if (str_contains($args['message'], 'John Doe')) {
    $args['to'] = 'john@doe.com';
    return $args;
  }
}


Example 2:
// redirect 'foreign contacts' if email is 'from another country'
// alternative use 'does not end with', (str_ends_with($args['to'], '.com') == False 
add_filter('wp_mail', 'medialog_foreign_redirect', 99);
function medialog_foreign_redirect($args)
{
   if (str_ends_with($args['to'], '.com')) {
    $args['to'] = 'foreigndepartment@company.com ';
    return $args;
  }
}


Example 3:
// Spam FILTER_VALIDATE_EMAIL
add_filter('wp_mail', 'medialog_mark_spam', 999);
function medialog_mark_spam($args)
{
   if (str_contains($args['message'], 'some random text')) {
    $args['subject'] = 'SPAM ';
    return $args;
  }
}