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There is no rule that you have to produce an equal volume of words in order for your correspondent to appreciate you. In fact, if you quote every sentence individually, inserting "I agree" or "goo...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/3281 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is no rule that you have to produce an equal volume of words in order for your correspondent to appreciate you. In fact, if you quote every sentence individually, inserting "I agree" or "good point" after each, that's going to lower people's impression of you -- it's a "me, too" reply, only worse because the person has to dig in case you had anything else to say. It's fine to just say something like "thank you for all your help; I really appreciate it". If you like, you can add "your point about (whatever) was particularly helpful to me". Don't quote the entire message; he already knows what it says since he wrote it.