Not visa, related but apparently all Tai mail to the US is being suspended according to Bangkok Post, true or more fake news?
TLDR : Answer Summary
There are reports that many countries, including Thailand, are suspending regular postal mail to the US due to a political shift regarding the Deminimus rule, which eliminates duty-free imports for parcels valued under $800. This situation has led to confusion and uncertainty about customs processing for the thousands of packages sent daily to the US. However, major shipping services like FedEx, UPS, and DHL continue to operate. Some commenters noted that exceptions exist for regular mail and low-value gifts. Despite these suspensions, individuals are still receiving mail from Thailand.