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It's not exactly the same, assuming you've already proposed a solution in the email, but it is still kind of redundant to say. I think most clients will let you know if they have a question, regardless if you write that.

If you think they might have questions, why not anticipate a question and answer it in the email?

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I also feel it's technically redundant -- like you said, they will follow up regardless -- but I think I do it to just give a more inviting tone/closing to the email.

However, I also used to end all of my StackOverflow questions with "Thanks in advance." just to be polite and appreciative to those spending their time reading/responding to my questions, until it kept getting edited out (for the same reason, redundant noise), so I got the hint and stopped.

Maybe this is similar?

About StackOverflow, it's probably because questions there are not supposed to be like a forum (as in, someone has a problem and wants a solution), but more like future reference for anyone searching for that. So they remove stuff that sounds more personal. That's my guess.

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