Save User Meta Email Address in Lowercase

you can use this filter to do that add_filter(“sanitize_email”, function ($sanitized_email, $email, $message) { $sanitized_email = strtolower($sanitized_email); return $sanitized_email; }, 10, 3); but I am not sure if using “strtolower” is a good idea, does another readers know if it’s better to use “mb_strtolower” to handle multibyte characters ? https://www.php.net/manual/en/ref.mbstring.php