How can I check the status of my 90-day visa renewal application sent by post to Immigration in Thailand?

To check if Immigration has received your 90-day renewal application sent by post, you can visit the EMS website and enter the tracking number found beneath the barcode on your EMS sticker. If you used a tracking service, simply refer to that number for updates. Please note that it is your responsibility to ensure timely reporting, as Immigration does not have control over postal services.