TM.30 self-file by EMS post to Chaeng Wattana - it took them almost 7 weeks to send back confirmation, but finally they did. So be patient folks :)
Actually it would make sense to have TM.30 self-file stands at the luggage collection section on the airports. Then we could do it easily when waiting for luggage.
TLDR : Answer Summary
Filing the TM30 self-notification by EMS post to the Chaeng Wattana Immigration office can take a significant amount of time, with reports indicating it may take almost 7 weeks to receive confirmation. Users suggest that having TM30 self-filing stations at airports could streamline the process for expats.