From Longman Dictionary of Contemporary Englishmany thanksmany thankswritten used especially in letters to thank someone for somethingmany thanks for Many thanks for your letter of 17 March. → many
Examples from the Corpus
many for• Many thanks for a thoroughly useful newspaper which is essential reading.• Many thanks for all your support.• I stood up swiftly, telling him many thanks for bothering.• Many thanks for concocting a circular for's Edinburgh week-end.• Many thanks for having us, we thoroughly enjoyed staying with you.• Thanks to Sam Wright for the transcription and many thanks for reading.• Many thanks for your help in this matter. 