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Re:Show HN: My Technical Blogging book for hackers and found... by dhimes on Wednesday September 21, 2011 @12:08PM (#3022514)
OK got it. You have to allow @pragprog.com to be one of your "allowed senders" on your Amazon Kindle management website. @free.kindle.com is set up automatically, so that wasn't the problem.

EDIT: BTW, hadn't heard from support when I found the fix.

Re:Show HN: My Technical Blogging book for hackers and found... by acangiano on Wednesday September 21, 2011 @12:33PM (#3022639)
I'm glad it's sorted out.