How contacting employers about job opportunities really works
In my experience of contacting employers and sending resumes, etc, things look like this:
1) Agencies mainly collect resumes to find naive native speakers who will accept their embarrassing job offers. This can be seen especially on Facebook groups and sometimes on Ajarn. The goal of the agency is to find naive, inexperienced native speakers ready to accept the worst conditions. "You live in a paradise, mate, so accept 30K salary and a 10 month-contract".
2) If a Thai teacher is in charge of recruiting, most often we will not get any response and if we do, it is 1-2 sentences long. Thai English teachers are generally afraid to write in English.
3) If a Filipino is in charge of recruitment (because a Thai teacher had the ad placed on the internet), we will get answers to all possible questions, in a very short time.