Do I need to report in person every time for my 90-day report after leaving Thailand?

I was told you can do online reporting if your address hasn't changed since last report. Foreign travel can mess that up.

I just did it by post and it came back ok (Bangkok, 1st one after returning from abroad)

Here is an example of the email they send you IF you get rejected after coming back into the country and trying to apply online.

You're out nothing by trying but many MANY people are indeed getting the rejection email

In person every time you return

IT being what it is, I would try it online 15 days prior due date, and if rejected, would go in person...

The new change is your very first 90 day report (once you have an entry/visa/extension that requires it) has to be done in person

AND

the very first 90 day report required after you return from abroad (the one due 89 days from the date you stamp in to the country) has to be done in person as well

So if you recently re-entered the country you need to do the next 90 day report in person