Q: Is “Many thanks” correct?
A: Yes, “many thanks” is perfectly correct both grammatical and standard English. It is appropriate to use “thanks” or “thank you” would be acceptable.
According to “Cambridge – Advanced Learner’s Dictionary”:
Thanks: (plural noun) words or actions that show you are grateful or pleased about something
- They expressed their thanks to the organisers.
- He wrote a letter of thanks to the hospital.
- Let us give thanks to God.