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Choose how granular you want to be about segmentation . The more granular you are, the more value youre likely to get out of this campaign. That is, you can pinpoint your dead contacts more accurately if you group your list in 3-month segments versus 6-month segments. The idea is that there a cliff i.e. there's a certain point in which all contacts beyond a certain age are too cold to continue emailing. The question you want to answer is, at what point does the number of bounces SPAM complaints, and dead addresses. buy quality email list