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In the context of email sending, in order to acknowledge an email which is
better?

> 回答有難うございます
>
> 返事有難うございます

Also, if you have some rules on when to use either, it would be much
appreciated!
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2014-08-14T00:17:00.207
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2020-06-17T08:18:27.500
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question
word-choice
Email: 「回答」vs「返事」
Based on own knowledge and some research:

  * 返事 is an answer when there is a conversation about a particular topic. Basically it is used when addressing an oral conversation but not exclusively.
  * 返信 when there was question sentence and answer sentence is provided.
  * 回答 is basically an answer as a matter. For example - answer to a claim (as a thing, not its contents).
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2014-08-14T00:47:59.333
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It all depends on the content of your most recent correspondence.

> If the other person has answered an important question that you had asked
> previously, you can use 「（ご）[回答]{かいとう}ありがとうございます。」 as 「回答」 means "an answer
> to a question".

I used the word "important" because something like "How are you?" is not one
of the questions I am talking about here.

The honorific 「ご」 would be a nice touch most of the time, but it would be
optional if you were way "above" the other person.

> If no Q&A has been performed recently, you cannot use the word 「回答」 like
> above. You can say, instead, 「お[返事]{へんじ}ありがとうございます。」 as 「返事」 only means
> "reply".

That honorific 「お」 is used virtually 100% of the time in this set phrase
regardless of your relationship with the other person.
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2014-08-14T00:55:10.943
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返事 = a reply 回答 = an answer

返る = to come back 答える = to answer

If you want to thank someone for answering your question, use 「回答」.

If you want to thank someone for replying to your communication, use 「返事」.
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