Is "many thanks" wrong?

When you want to thank someone, which word is the most traditional?
I always used "many thanks" before a friend told me it's wrong.  In my work email, she told me you should use "much thanks". Is this correct? I can find the word in the dictionary, meaning lots of thanks, and other colleagues use the word many thanks.
So who can tell me which is correct, "many thanks" or "much thanks"? Or are both of them correct? What's the difference?

"many thanks "is a wrong word?

When you want to thank anyone someone,_which word is the most appropriate traditional?

I aways use "many thanks" before a friend told me that it is a wrong word,_even in my work emails,_ she told me you should use"much thanks" should be used instead. ,Is it this correct? But However, I can find the word phrase in the dictionary,the to meaning is lots plenty of thank yous. and Then I always saw see many other colleagues use the word: "many thanks".

so ,who can tell me ,"many thanks " and "much thanks ",So which one will be is correct? or Can both of them is be correct? What's the difference?

Both are correct.  It depends on how you look at it.  First of all the most formal way of saying thanks is "Thank you very much" ("Thanking you very many" is WRONG!)

The difference lies in whether you consider "thanking" is countable or not.  Some believe it is and others do not.

Much thanks - thanking is non-countable.

Many thanks - thanking is countable.

However both are considered informal.  "Thanking" itself is uncountable.  However, the number of times to thank is countable.  Hence this confusion.  Just like in some Chinese expressions, some words are left out to shorten the phrase.  So in time, these left out words are forgotten and the confusion arises.

"a lot" this I considered as informal and also shows that the person using it does not understand the concept of countable and uncountable nouns.  The more "correct" words are "many" and "much".  How you use words determine how deep your educational background is (if you are a native speaker) or how well you are versed in the language (for non-native speakers).