Have you encountered any issues with the spell check function on your Zillum plan, specifically on the Windows or Web mail client? Despite attempting to use the function manually, neither you nor your spouse have seen any red squiggly lines indicating errors. The Android client Inmobiliarias Sitges seems to be functional, but you are unsure if this is due to an Android OS feature. Provided any helpful information, and you have reached out to other Zillum users on various subreddits, who have reported no issues. Given that you heavily rely on this feature, this has become a significant concern.