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    That’s kind of, not really, a CSV file. Commented Mar 22, 2018 at 0:33
  • Email addresses, not emails, or do I miss something? Is the order relevant or can you sort it? Do lines with multiple entries have to kept together or are you allowed to split them to different lines? Commented Mar 23, 2018 at 2:32
  • Has the id to be preserved? What is the amount of data you have? How long does it take with an iterative approach, and what might replace it, without iterating? How much time is acceptable? Commented Mar 23, 2018 at 2:41