Is a hotel-issued letter sufficient instead of a TM30 for immigration reporting in Thailand?

The original poster is inquiring whether a signed letter from their hotel manager stating their stay is an adequate substitute for the TM30 form required for immigration reporting in Thailand. Responses suggest that while some users have received TM30 forms from hotels, others point out that a signed letter may not be sufficient and recommend verifying the hotel's online registration system. Some assert that the immigration office should have access to their registration records, while others caution that the letter is not a formal TM30 and advise taking the letter to immigration for clarification.