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Not only possible, but better. Publishers want to know that there is a market for your work. The success of your blog posts proves that there is. But there is a catch. Under what contract did you...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/26671 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/26671 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Not only possible, but better. Publishers want to know that there is a market for your work. The success of your blog posts proves that there is. But there is a catch. Under what contract did you write those guest posts? Did you assign copyright to the site or did you retain it. If you assigned copyright to them then you will need their permission to reproduce it in your book (and the publisher will ask to see that permission granted in writing).